<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019b99e9-ecb1-7fcf-9ecb-5d201c6cd9b2,g:e489b880-f9a8-48b8-b562-98e8bf2adc92-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.smartm.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="sgh-20260227.xsd#ConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019b99e9-ee06-7cbf-a96a-44c0fb050ef8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019b99e9-ee06-7fc4-975f-876475e4ad68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7cbf-a96a-44c0fb050ef8" xlink:to="loc_us-gaap_StatementTable_019b99e9-ee06-7fc4-975f-876475e4ad68" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-ee06-79e6-85f9-e064ff4afdf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019b99e9-ee06-7fc4-975f-876475e4ad68" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-ee06-79e6-85f9-e064ff4afdf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-79e6-85f9-e064ff4afdf7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-ee06-79e6-85f9-e064ff4afdf7" xlink:to="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-79e6-85f9-e064ff4afdf7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7a81-822d-d620c88f53e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-ee06-79e6-85f9-e064ff4afdf7" xlink:to="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7a81-822d-d620c88f53e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019b99e9-ee06-7504-bc40-a4e702b27abb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7a81-822d-d620c88f53e3" xlink:to="loc_us-gaap_NonrelatedPartyMember_019b99e9-ee06-7504-bc40-a4e702b27abb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019b99e9-ee06-7488-b7a2-3543bdabd4cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7a81-822d-d620c88f53e3" xlink:to="loc_us-gaap_RelatedPartyMember_019b99e9-ee06-7488-b7a2-3543bdabd4cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7cbf-a96a-44c0fb050ef8" xlink:to="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019b99e9-ee06-76bc-84dd-5ad1043ddddd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019b99e9-ee06-76bc-84dd-5ad1043ddddd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019b99e9-ee06-7f05-97a9-c40635deb698" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019b99e9-ee06-7f05-97a9-c40635deb698" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019b99e9-ee06-7bea-8523-573988ab5536" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_InventoryNet_019b99e9-ee06-7bea-8523-573988ab5536" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_019b99e9-ee06-73c4-bba4-b070f93de0e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_OtherAssetsCurrent_019b99e9-ee06-73c4-bba4-b070f93de0e3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019b99e9-ee06-786d-a7e1-9d4ec2be25dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_AssetsCurrent_019b99e9-ee06-786d-a7e1-9d4ec2be25dd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019b99e9-ee06-7d7d-9b8c-0999d307028c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019b99e9-ee06-7d7d-9b8c-0999d307028c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019b99e9-ee06-73f3-8fef-728e5fc81ad1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019b99e9-ee06-73f3-8fef-728e5fc81ad1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019b99e9-ee06-777a-9238-f78a7eab3631" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019b99e9-ee06-777a-9238-f78a7eab3631" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019b99e9-ee06-7232-bde4-f9f0112d70ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_Goodwill_019b99e9-ee06-7232-bde4-f9f0112d70ed" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_019b99e9-ee06-7500-bbfd-112b886eacb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_019b99e9-ee06-7500-bbfd-112b886eacb3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019b99e9-ee06-7543-aab7-e7c00d51c1a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019b99e9-ee06-7543-aab7-e7c00d51c1a1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019b99e9-ee06-705a-b780-9412247d94c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019b99e9-ee06-741b-ab6d-e2e8a3aeb1b7" xlink:to="loc_us-gaap_Assets_019b99e9-ee06-705a-b780-9412247d94c5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7cbf-a96a-44c0fb050ef8" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_019b99e9-ee06-74aa-af27-2a092119e1d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_019b99e9-ee06-74aa-af27-2a092119e1d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019b99e9-ee06-7030-8af4-ecdd8c8c2c4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_LongTermDebtCurrent_019b99e9-ee06-7030-8af4-ecdd8c8c2c4d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenueCurrent_019b99e9-ee06-71f1-957a-af681baa5386" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredRevenueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_DeferredRevenueCurrent_019b99e9-ee06-71f1-957a-af681baa5386" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_019b99e9-ee06-7115-86d3-b3111caea7f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_019b99e9-ee06-7115-86d3-b3111caea7f3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019b99e9-ee06-7d5b-8bd3-3980ddb33414" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_LiabilitiesCurrent_019b99e9-ee06-7d5b-8bd3-3980ddb33414" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019b99e9-ee06-73c7-aa42-82d87e1101d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019b99e9-ee06-73c7-aa42-82d87e1101d2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019b99e9-ee06-7731-afd7-c1265f6976a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019b99e9-ee06-7731-afd7-c1265f6976a1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019b99e9-ee06-71da-b7ba-0b33e98c9e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019b99e9-ee06-71da-b7ba-0b33e98c9e1d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019b99e9-ee06-7a1f-9726-bf05b2c26942" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_Liabilities_019b99e9-ee06-7a1f-9726-bf05b2c26942" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019b99e9-ee06-78d5-92a8-60a49e9564c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019b99e9-ee06-78d5-92a8-60a49e9564c4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityAbstract_019b99e9-ee06-7f17-ba01-55e54bf8cd52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_TemporaryEquityAbstract_019b99e9-ee06-7f17-ba01-55e54bf8cd52" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_019b99e9-ee06-7e23-af85-320f10280e40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityAbstract_019b99e9-ee06-7f17-ba01-55e54bf8cd52" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_019b99e9-ee06-7e23-af85-320f10280e40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValueOutstanding_019b99e9-ee06-7eb7-9804-dc9343e74624" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:to="loc_us-gaap_CommonStockValueOutstanding_019b99e9-ee06-7eb7-9804-dc9343e74624" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019b99e9-ee06-7c3e-b452-70a1255b0364" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019b99e9-ee06-7c3e-b452-70a1255b0364" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019b99e9-ee06-71f1-af06-2a5944c20353" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019b99e9-ee06-71f1-af06-2a5944c20353" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonValue_019b99e9-ee06-71ce-99e5-835df7b4020e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:to="loc_us-gaap_TreasuryStockCommonValue_019b99e9-ee06-71ce-99e5-835df7b4020e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019b99e9-ee06-7eef-b947-88a6f81cac05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019b99e9-ee06-7eef-b947-88a6f81cac05" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019b99e9-ee06-7536-a283-c2268aa53155" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:to="loc_us-gaap_StockholdersEquity_019b99e9-ee06-7536-a283-c2268aa53155" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019b99e9-ee06-7b50-bebb-1ec7d4face17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:to="loc_us-gaap_MinorityInterest_019b99e9-ee06-7b50-bebb-1ec7d4face17" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019b99e9-ee06-70bf-9604-654a90e26b46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019b99e9-ee06-7b8a-adab-ae6c2e6a1df6" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019b99e9-ee06-70bf-9604-654a90e26b46" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019b99e9-ee06-7e35-9e58-b7ede47d6b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019b99e9-ee06-7428-82f9-6f07a796c547" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019b99e9-ee06-7e35-9e58-b7ede47d6b0d" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/ConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="sgh-20260227.xsd#ConsolidatedStatementsofOperations"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/ConsolidatedStatementsofOperations" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019b99e9-ee06-7e6a-b2f8-b31cb8f7a682" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_StatementTable_019b99e9-ee06-7e6a-b2f8-b31cb8f7a682" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019b99e9-ee06-7032-bcc0-249fe5e08f1d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019b99e9-ee06-7e6a-b2f8-b31cb8f7a682" xlink:to="loc_srt_ProductOrServiceAxis_019b99e9-ee06-7032-bcc0-249fe5e08f1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b99e9-ee06-7032-bcc0-249fe5e08f1d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019b99e9-ee06-7032-bcc0-249fe5e08f1d" xlink:to="loc_srt_ProductsAndServicesDomain_019b99e9-ee06-7032-bcc0-249fe5e08f1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b99e9-ee06-7688-ac34-1c1bd4aee2e1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019b99e9-ee06-7032-bcc0-249fe5e08f1d" xlink:to="loc_srt_ProductsAndServicesDomain_019b99e9-ee06-7688-ac34-1c1bd4aee2e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_019b99e9-ee06-7eb6-94bb-f84d0ff02a27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b99e9-ee06-7688-ac34-1c1bd4aee2e1" xlink:to="loc_us-gaap_ProductMember_019b99e9-ee06-7eb6-94bb-f84d0ff02a27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_019b99e9-ee06-7c2f-a091-b9c2e1fad54f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b99e9-ee06-7688-ac34-1c1bd4aee2e1" xlink:to="loc_us-gaap_ServiceMember_019b99e9-ee06-7c2f-a091-b9c2e1fad54f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-ee06-7a3b-97a7-cd7c3fe5f0f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019b99e9-ee06-7e6a-b2f8-b31cb8f7a682" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-ee06-7a3b-97a7-cd7c3fe5f0f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7a3b-97a7-cd7c3fe5f0f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-ee06-7a3b-97a7-cd7c3fe5f0f2" xlink:to="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7a3b-97a7-cd7c3fe5f0f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7938-a6d1-680d519c1874" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-ee06-7a3b-97a7-cd7c3fe5f0f2" xlink:to="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7938-a6d1-680d519c1874" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019b99e9-ee06-7403-8986-e5a5c4993471" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7938-a6d1-680d519c1874" xlink:to="loc_us-gaap_NonrelatedPartyMember_019b99e9-ee06-7403-8986-e5a5c4993471" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019b99e9-ee06-7dfd-92a9-210690df81bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019b99e9-ee06-7938-a6d1-680d519c1874" xlink:to="loc_us-gaap_RelatedPartyMember_019b99e9-ee06-7dfd-92a9-210690df81bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019b99e9-ee06-746a-a034-f0d6efed3a77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019b99e9-ee06-746a-a034-f0d6efed3a77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019b99e9-ee06-729f-9ffe-9c401961c96c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019b99e9-ee06-729f-9ffe-9c401961c96c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019b99e9-ee06-7f10-beae-faf3bb072f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_GrossProfit_019b99e9-ee06-7f10-beae-faf3bb072f7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_019b99e9-ee06-7c85-8481-404a369754f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_OperatingExpensesAbstract_019b99e9-ee06-7c85-8481-404a369754f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019b99e9-ee06-7fef-8e8e-58bf576143fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019b99e9-ee06-7c85-8481-404a369754f9" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019b99e9-ee06-7fef-8e8e-58bf576143fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019b99e9-ee06-784e-a605-bc66f6c19216" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019b99e9-ee06-7c85-8481-404a369754f9" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019b99e9-ee06-784e-a605-bc66f6c19216" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_019cd5c2-52f2-709c-8094-b8905e164521" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019b99e9-ee06-7c85-8481-404a369754f9" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_019cd5c2-52f2-709c-8094-b8905e164521" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_019b99e9-ee06-75f0-ba12-08dbbc052a21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019b99e9-ee06-7c85-8481-404a369754f9" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_019b99e9-ee06-75f0-ba12-08dbbc052a21" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019b99e9-ee06-7340-a092-43732f3d363a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019b99e9-ee06-7c85-8481-404a369754f9" xlink:to="loc_us-gaap_OperatingExpenses_019b99e9-ee06-7340-a092-43732f3d363a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019b99e9-ee06-72b6-ba6d-81dd03ecbfef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_OperatingIncomeLoss_019b99e9-ee06-72b6-ba6d-81dd03ecbfef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019b99e9-ee06-7cd4-91fb-2fd43acd11a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019b99e9-ee06-7cd4-91fb-2fd43acd11a8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019b99e9-ee06-70da-ba32-4d25a373ed79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019b99e9-ee06-7cd4-91fb-2fd43acd11a8" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019b99e9-ee06-70da-ba32-4d25a373ed79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019b99e9-ee06-79e0-817c-a9e5b0c97e88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019b99e9-ee06-7cd4-91fb-2fd43acd11a8" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019b99e9-ee06-79e0-817c-a9e5b0c97e88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019b99e9-ee06-7cb2-9510-cfc485d51382" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019b99e9-ee06-7cd4-91fb-2fd43acd11a8" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019b99e9-ee06-7cb2-9510-cfc485d51382" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019b99e9-ee06-7443-9f73-b5ded3cae7ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019b99e9-ee06-7443-9f73-b5ded3cae7ba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019b99e9-ee06-7d07-a01e-e61cc70e8be5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019b99e9-ee06-7d07-a01e-e61cc70e8be5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019b99e9-ee06-78ce-966b-e59416426566" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_ProfitLoss_019b99e9-ee06-78ce-966b-e59416426566" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019b99e9-ee06-70a4-8442-781085cf452f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019b99e9-ee06-70a4-8442-781085cf452f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019b99e9-ee06-702e-a07a-813176dd4b0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_NetIncomeLoss_019b99e9-ee06-702e-a07a-813176dd4b0b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019b99e9-ee06-779a-928d-cbd936618830" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019b99e9-ee06-779a-928d-cbd936618830" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_NetIncomeLossAvailableForDistributionBasic_019b99e9-ee06-7154-8920-13aea1b757be" xlink:href="sgh-20260227.xsd#sgh_NetIncomeLossAvailableForDistributionBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_sgh_NetIncomeLossAvailableForDistributionBasic_019b99e9-ee06-7154-8920-13aea1b757be" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_019b99e9-ee06-7438-99e7-fdcacc43a002" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_019b99e9-ee06-7438-99e7-fdcacc43a002" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019b99e9-ee06-71fe-9530-0e41967f8206" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019b99e9-ee06-71fe-9530-0e41967f8206" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019b99e9-ee06-7f44-b60f-cf90a438c968" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019b99e9-ee06-7f44-b60f-cf90a438c968" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_019b99e9-ee06-7f81-b443-72af53f9e01b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_EarningsPerShareAbstract_019b99e9-ee06-7f81-b443-72af53f9e01b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019b99e9-ee06-7766-8b79-f9dc41f8722b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019b99e9-ee06-7f81-b443-72af53f9e01b" xlink:to="loc_us-gaap_EarningsPerShareBasic_019b99e9-ee06-7766-8b79-f9dc41f8722b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019b99e9-ee06-7064-93b8-1b9d5b0c073a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019b99e9-ee06-7f81-b443-72af53f9e01b" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019b99e9-ee06-7064-93b8-1b9d5b0c073a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019b99e9-ee06-79f5-b0dd-b5ce96b28034" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7319-8ac5-dd198bab59f0" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019b99e9-ee06-79f5-b0dd-b5ce96b28034" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019b99e9-ee06-70e0-a0a9-8d16ea80b8b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019b99e9-ee06-79f5-b0dd-b5ce96b28034" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019b99e9-ee06-70e0-a0a9-8d16ea80b8b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019b99e9-ee06-75ed-9a95-d2c9f2660399" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019b99e9-ee06-79f5-b0dd-b5ce96b28034" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019b99e9-ee06-75ed-9a95-d2c9f2660399" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/ConsolidatedStatementsofStockholdersEquity" xlink:type="simple" xlink:href="sgh-20260227.xsd#ConsolidatedStatementsofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/ConsolidatedStatementsofStockholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019b99e9-ee06-7d4b-97b8-6944fb142535" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019b99e9-ee06-7fa2-9adf-7b842041b2dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7d4b-97b8-6944fb142535" xlink:to="loc_us-gaap_StatementTable_019b99e9-ee06-7fa2-9adf-7b842041b2dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019b99e9-ee06-7dc5-a860-f0a2526f5d1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019b99e9-ee06-7fa2-9adf-7b842041b2dc" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019b99e9-ee06-7dc5-a860-f0a2526f5d1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7dc5-a860-f0a2526f5d1a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019b99e9-ee06-7dc5-a860-f0a2526f5d1a" xlink:to="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7dc5-a860-f0a2526f5d1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019b99e9-ee06-7dc5-a860-f0a2526f5d1a" xlink:to="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019b99e9-ee06-7ee7-9400-f391748ed76b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:to="loc_us-gaap_CommonStockMember_019b99e9-ee06-7ee7-9400-f391748ed76b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cd5cd-673d-75f2-ac9d-1be4fff4a7e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:to="loc_us-gaap_PreferredStockMember_019cd5cd-673d-75f2-ac9d-1be4fff4a7e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019b99e9-ee06-72ac-9213-6c983f2a2f91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019b99e9-ee06-72ac-9213-6c983f2a2f91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019b99e9-ee06-7805-8584-ab591f3d9216" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:to="loc_us-gaap_RetainedEarningsMember_019b99e9-ee06-7805-8584-ab591f3d9216" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019b99e9-ee06-7b2e-b233-f4558a27ba41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019b99e9-ee06-7b2e-b233-f4558a27ba41" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019b99e9-ee06-7476-a953-458a989b18a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019b99e9-ee06-7476-a953-458a989b18a9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_019b99e9-ee06-71c2-950c-ebddccad5315" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:to="loc_us-gaap_ParentMember_019b99e9-ee06-71c2-950c-ebddccad5315" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019b99e9-ee06-71f5-966b-f9d0519f0f83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-ee06-7f3a-b88c-0562c5ed3b82" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019b99e9-ee06-71f5-966b-f9d0519f0f83" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019b99e9-ee06-7d4b-97b8-6944fb142535" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019b99e9-ee06-7ac3-b014-ce38f5ff2c3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019b99e9-ee06-7ac3-b014-ce38f5ff2c3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019b99e9-ee06-7e6f-b584-76c8932e7f23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019b99e9-ee06-7e6f-b584-76c8932e7f23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019b99e9-ee06-73a0-8451-1ce0b8225f3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_ProfitLoss_019b99e9-ee06-73a0-8451-1ce0b8225f3d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019b99e9-ee06-7ef2-87e1-46fee233bdc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019b99e9-ee06-7ef2-87e1-46fee233bdc7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019b99e9-ee06-7f50-b6e4-1e5283bddbfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019b99e9-ee06-7f50-b6e4-1e5283bddbfc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019b99e9-ee06-7332-b7ff-3b6a5c1ca573" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019b99e9-ee06-7332-b7ff-3b6a5c1ca573" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_019b99e9-ee06-7b28-974b-08d54f2bd3a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_019b99e9-ee06-7b28-974b-08d54f2bd3a0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019b99e9-ee06-7b3f-8f13-19d0becfe432" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019b99e9-ee06-7b3f-8f13-19d0becfe432" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_StockIssuedDuringPeriodPreferredStockShares_019cd5cd-673d-7842-aeb4-139596fe6679" xlink:href="sgh-20260227.xsd#sgh_StockIssuedDuringPeriodPreferredStockShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_sgh_StockIssuedDuringPeriodPreferredStockShares_019cd5cd-673d-7842-aeb4-139596fe6679" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_StockIssuedDuringPeriodPreferredStockAmount_019cd5cd-673d-71de-82f2-12b681491f0a" xlink:href="sgh-20260227.xsd#sgh_StockIssuedDuringPeriodPreferredStockAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_sgh_StockIssuedDuringPeriodPreferredStockAmount_019cd5cd-673d-71de-82f2-12b681491f0a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStock_019b99e9-ee06-7cb3-9171-e306cb8136ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019b99e9-ee06-715d-b4a2-b888b7d513bb" xlink:to="loc_us-gaap_DividendsPreferredStock_019b99e9-ee06-7cb3-9171-e306cb8136ae" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019b99e9-ee06-7a44-a79c-e1d6bf4d0152" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019b99e9-ee06-75c9-8ed6-88ed53f8fc78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/CashandInvestmentsNarrativeDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#CashandInvestmentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/CashandInvestmentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019d27c4-409d-71f3-abad-e14f78ce9714" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019d27c4-409d-71f3-abad-e14f78ce9714" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019d27c4-409d-7a19-a250-73ee24a26e66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019d27c4-409d-71f3-abad-e14f78ce9714" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019d27c4-409d-7a19-a250-73ee24a26e66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d27c4-409d-7a19-a250-73ee24a26e66_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019d27c4-409d-7a19-a250-73ee24a26e66" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d27c4-409d-7a19-a250-73ee24a26e66_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d27c4-409d-7c20-be1e-cc9e9a9a2e59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019d27c4-409d-7a19-a250-73ee24a26e66" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d27c4-409d-7c20-be1e-cc9e9a9a2e59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_CelestialAIPreferredSharesMember_019d27c4-409d-7b27-b4c7-0db0bed4e914" xlink:href="sgh-20260227.xsd#sgh_CelestialAIPreferredSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d27c4-409d-7c20-be1e-cc9e9a9a2e59" xlink:to="loc_sgh_CelestialAIPreferredSharesMember_019d27c4-409d-7b27-b4c7-0db0bed4e914" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_ZiliaTechnologiesMember_019d27c6-3b69-7621-a9d8-6106334d8d27" xlink:href="sgh-20260227.xsd#sgh_ZiliaTechnologiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d27c4-409d-7c20-be1e-cc9e9a9a2e59" xlink:to="loc_sgh_ZiliaTechnologiesMember_019d27c6-3b69-7621-a9d8-6106334d8d27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_OneNonMarketableEquityInvestmentMember_019d2ffa-3c8b-7066-be2a-6dc49a2b4930" xlink:href="sgh-20260227.xsd#sgh_OneNonMarketableEquityInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d27c4-409d-7c20-be1e-cc9e9a9a2e59" xlink:to="loc_sgh_OneNonMarketableEquityInvestmentMember_019d2ffa-3c8b-7066-be2a-6dc49a2b4930" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_019d27c4-409d-7c85-8548-8e01f1fc9bef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019d27c4-409d-71f3-abad-e14f78ce9714" xlink:to="loc_us-gaap_TransactionTypeAxis_019d27c4-409d-7c85-8548-8e01f1fc9bef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_019d27c4-409d-7c85-8548-8e01f1fc9bef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_019d27c4-409d-7c85-8548-8e01f1fc9bef" xlink:to="loc_us-gaap_TransactionDomain_019d27c4-409d-7c85-8548-8e01f1fc9bef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_019d27c4-409d-73b5-8483-1be72f7ba516" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_019d27c4-409d-7c85-8548-8e01f1fc9bef" xlink:to="loc_us-gaap_TransactionDomain_019d27c4-409d-73b5-8483-1be72f7ba516" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_CelestialAIMergerMember_019d27c4-409d-77f3-b6bd-7fc150275c27" xlink:href="sgh-20260227.xsd#sgh_CelestialAIMergerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_019d27c4-409d-73b5-8483-1be72f7ba516" xlink:to="loc_sgh_CelestialAIMergerMember_019d27c4-409d-77f3-b6bd-7fc150275c27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019d27c6-3b69-773e-b549-1889d785b2b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019d27c4-409d-71f3-abad-e14f78ce9714" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019d27c6-3b69-773e-b549-1889d785b2b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019d27c6-3b69-773e-b549-1889d785b2b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019d27c6-3b69-773e-b549-1889d785b2b0" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019d27c6-3b69-773e-b549-1889d785b2b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019d27c6-3b69-7ad2-9986-eb658a6b07c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019d27c6-3b69-773e-b549-1889d785b2b0" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019d27c6-3b69-7ad2-9986-eb658a6b07c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019d27c6-3b69-76d9-9813-7c9c01fa0154" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019d27c6-3b69-7ad2-9986-eb658a6b07c6" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019d27c6-3b69-76d9-9813-7c9c01fa0154" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019d27c6-3b69-7418-af53-b6424e5db06d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019d27c4-409d-71f3-abad-e14f78ce9714" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019d27c6-3b69-7418-af53-b6424e5db06d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d27c6-3b69-7418-af53-b6424e5db06d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019d27c6-3b69-7418-af53-b6424e5db06d" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d27c6-3b69-7418-af53-b6424e5db06d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d27c6-3b69-73db-a4d7-6016b79cea5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019d27c6-3b69-7418-af53-b6424e5db06d" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d27c6-3b69-73db-a4d7-6016b79cea5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_ZiliaTechnologiesMember_019d27c6-3b69-7e81-9905-0a39634640d1" xlink:href="sgh-20260227.xsd#sgh_ZiliaTechnologiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d27c6-3b69-73db-a4d7-6016b79cea5f" xlink:to="loc_sgh_ZiliaTechnologiesMember_019d27c6-3b69-7e81-9905-0a39634640d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019d27c6-3b69-7b62-8dc8-da95a8148184" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019d27c4-409d-71f3-abad-e14f78ce9714" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019d27c6-3b69-7b62-8dc8-da95a8148184" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019d27c6-3b69-7b62-8dc8-da95a8148184_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019d27c6-3b69-7b62-8dc8-da95a8148184" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019d27c6-3b69-7b62-8dc8-da95a8148184_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019d27c6-3b69-7299-9d55-3cd16e7a26ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019d27c6-3b69-7b62-8dc8-da95a8148184" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019d27c6-3b69-7299-9d55-3cd16e7a26ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019d27c6-3b69-740a-a086-329b9c8ce4ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019d27c6-3b69-7299-9d55-3cd16e7a26ad" xlink:to="loc_us-gaap_SubsequentEventMember_019d27c6-3b69-740a-a086-329b9c8ce4ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_019d27c5-f8e4-7471-928b-7448fa935f7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_019d27c5-f8e4-7471-928b-7448fa935f7b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFVNINoncurrent_019d27c4-409d-7559-9859-814b76042393" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFVNINoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_us-gaap_EquitySecuritiesFVNINoncurrent_019d27c4-409d-7559-9859-814b76042393" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_MergerTransactionConsiderationReceived_019d27c4-409d-77fc-ab29-edb22d7296bf" xlink:href="sgh-20260227.xsd#sgh_MergerTransactionConsiderationReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_MergerTransactionConsiderationReceived_019d27c4-409d-77fc-ab29-edb22d7296bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_MergerTransactionConsiderationTransferredEquityInterestShareIssuedNumberOfShares_019d27c4-409d-7a11-a2de-519adf7cb47c" xlink:href="sgh-20260227.xsd#sgh_MergerTransactionConsiderationTransferredEquityInterestShareIssuedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_MergerTransactionConsiderationTransferredEquityInterestShareIssuedNumberOfShares_019d27c4-409d-7a11-a2de-519adf7cb47c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_MergerTransactionConsiderationTransferredEquityInterestFairValue_019d27c4-409d-792f-b494-32210f8a6849" xlink:href="sgh-20260227.xsd#sgh_MergerTransactionConsiderationTransferredEquityInterestFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_MergerTransactionConsiderationTransferredEquityInterestFairValue_019d27c4-409d-792f-b494-32210f8a6849" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_MergerTransactionGainLossOnConsiderationReceived_019d27c4-409d-7e5d-918d-0b0e0b60f386" xlink:href="sgh-20260227.xsd#sgh_MergerTransactionGainLossOnConsiderationReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_MergerTransactionGainLossOnConsiderationReceived_019d27c4-409d-7e5d-918d-0b0e0b60f386" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_SaleOfEquityInterestMergerShares_019d27c4-409d-7de5-a640-22f7e727544f" xlink:href="sgh-20260227.xsd#sgh_SaleOfEquityInterestMergerShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_SaleOfEquityInterestMergerShares_019d27c4-409d-7de5-a640-22f7e727544f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_ProceedsFromSaleOfMergerEquityInterest_019d27c4-409d-7164-8917-1e02d74a39a5" xlink:href="sgh-20260227.xsd#sgh_ProceedsFromSaleOfMergerEquityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_ProceedsFromSaleOfMergerEquityInterest_019d27c4-409d-7164-8917-1e02d74a39a5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_GainLossOnSaleOfMergerEquityInterest_019d27c4-409d-78b0-86ea-f26c35d65e3f" xlink:href="sgh-20260227.xsd#sgh_GainLossOnSaleOfMergerEquityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_GainLossOnSaleOfMergerEquityInterest_019d27c4-409d-78b0-86ea-f26c35d65e3f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_MergerTransactionContingentConsiderationRevenueMilestoneTargetAmount_019d41ac-afa8-79d3-9d89-bd902d6ed5fb" xlink:href="sgh-20260227.xsd#sgh_MergerTransactionContingentConsiderationRevenueMilestoneTargetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_MergerTransactionContingentConsiderationRevenueMilestoneTargetAmount_019d41ac-afa8-79d3-9d89-bd902d6ed5fb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_MergerTransactionContingentConsiderationRevenueMilestoneTargetFullEarnoutAmount_019d41ac-afa8-72a3-b8c4-4853f8e6785d" xlink:href="sgh-20260227.xsd#sgh_MergerTransactionContingentConsiderationRevenueMilestoneTargetFullEarnoutAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_MergerTransactionContingentConsiderationRevenueMilestoneTargetFullEarnoutAmount_019d41ac-afa8-72a3-b8c4-4853f8e6785d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019d27c6-3b69-7815-b411-e814a6f6408a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019d27c6-3b69-7815-b411-e814a6f6408a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AlternativeInvestment_019d27c6-3b69-7e2a-96a9-8084b5925735" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AlternativeInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_us-gaap_AlternativeInvestment_019d27c6-3b69-7e2a-96a9-8084b5925735" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_019d321a-59f5-723a-824d-c45362fe94a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_019d321a-59f5-723a-824d-c45362fe94a7" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_IncomeTaxWithholdingOnEquityMethodInvestments_019d321b-11f8-7343-9629-327517bc5bd2" xlink:href="sgh-20260227.xsd#sgh_IncomeTaxWithholdingOnEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_IncomeTaxWithholdingOnEquityMethodInvestments_019d321b-11f8-7343-9629-327517bc5bd2" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_GainLossOnImpairmentOfNonMarketableEquityInvestment_019d27c7-0387-7225-9f95-515208ef137a" xlink:href="sgh-20260227.xsd#sgh_GainLossOnImpairmentOfNonMarketableEquityInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019d27c4-409d-7c93-9d52-ff03488b6195" xlink:to="loc_sgh_GainLossOnImpairmentOfNonMarketableEquityInvestment_019d27c7-0387-7225-9f95-515208ef137a" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/CashandInvestmentsScheduleofCashCashEquivalentsandShorttermInvestmentsDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#CashandInvestmentsScheduleofCashCashEquivalentsandShorttermInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/CashandInvestmentsScheduleofCashCashEquivalentsandShorttermInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsLineItems_019b99e9-ee06-7012-ace1-26b66ffb68da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019b99e9-ee06-769e-900f-a14cf97718f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019b99e9-ee06-7012-ace1-26b66ffb68da" xlink:to="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019b99e9-ee06-769e-900f-a14cf97718f3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019b99e9-ee06-7f76-b43f-8f0b6543f013" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019b99e9-ee06-769e-900f-a14cf97718f3" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019b99e9-ee06-7f76-b43f-8f0b6543f013" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019b99e9-ee06-7f76-b43f-8f0b6543f013_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019b99e9-ee06-7f76-b43f-8f0b6543f013" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019b99e9-ee06-7f76-b43f-8f0b6543f013_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019b99e9-ee06-7538-adb0-424cc0f16a40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019b99e9-ee06-7f76-b43f-8f0b6543f013" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019b99e9-ee06-7538-adb0-424cc0f16a40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashMember_019b99e9-ee06-7b22-9aad-55f6f7855d7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019b99e9-ee06-7538-adb0-424cc0f16a40" xlink:to="loc_us-gaap_CashMember_019b99e9-ee06-7b22-9aad-55f6f7855d7b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019b99e9-ee06-7089-9a95-639c46975f93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019b99e9-ee06-769e-900f-a14cf97718f3" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019b99e9-ee06-7089-9a95-639c46975f93" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b99e9-ee06-7089-9a95-639c46975f93_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019b99e9-ee06-7089-9a95-639c46975f93" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b99e9-ee06-7089-9a95-639c46975f93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b99e9-ee06-7e10-ab22-347e79596793" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019b99e9-ee06-7089-9a95-639c46975f93" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b99e9-ee06-7e10-ab22-347e79596793" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019b99e9-ee06-70e2-8e11-530c710b43ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b99e9-ee06-7e10-ab22-347e79596793" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019b99e9-ee06-70e2-8e11-530c710b43ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019b99e9-ee06-77d3-993b-be7039413d0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019b99e9-ee06-769e-900f-a14cf97718f3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019b99e9-ee06-77d3-993b-be7039413d0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-ee06-77d3-993b-be7039413d0e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019b99e9-ee06-77d3-993b-be7039413d0e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-ee06-77d3-993b-be7039413d0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-ee06-79bc-8809-67f93d9bf01e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019b99e9-ee06-77d3-993b-be7039413d0e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-ee06-79bc-8809-67f93d9bf01e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019b99e9-ee06-7d69-bccf-8fca29400ecd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-ee06-79bc-8809-67f93d9bf01e" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019b99e9-ee06-7d69-bccf-8fca29400ecd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019b99e9-ee06-7bab-8f6f-2afea7fd14b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019b99e9-ee06-7012-ace1-26b66ffb68da" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019b99e9-ee06-7bab-8f6f-2afea7fd14b4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/PropertyandEquipmentDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#PropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/PropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019b99e9-ee06-75dd-aeec-00d2cf6286b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019b99e9-ee06-716c-a53f-40ca84a06909" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019b99e9-ee06-75dd-aeec-00d2cf6286b1" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019b99e9-ee06-716c-a53f-40ca84a06909" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019b99e9-ee06-751c-ae64-c60dc94fb0ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019b99e9-ee06-716c-a53f-40ca84a06909" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019b99e9-ee06-751c-ae64-c60dc94fb0ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019b99e9-ee06-751c-ae64-c60dc94fb0ee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019b99e9-ee06-751c-ae64-c60dc94fb0ee" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019b99e9-ee06-751c-ae64-c60dc94fb0ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019b99e9-ee06-73f1-80fc-457492dbff4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019b99e9-ee06-751c-ae64-c60dc94fb0ee" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019b99e9-ee06-73f1-80fc-457492dbff4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_019b99e9-ee06-75b0-95df-9858a528fd52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019b99e9-ee06-73f1-80fc-457492dbff4e" xlink:to="loc_us-gaap_EquipmentMember_019b99e9-ee06-75b0-95df-9858a528fd52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_019b99e9-ee06-7ab6-8ff6-0d7276772cc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019b99e9-ee06-73f1-80fc-457492dbff4e" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_019b99e9-ee06-7ab6-8ff6-0d7276772cc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_FurnitureFixturesAndSoftwareMember_019b99e9-ee06-7b8e-9c42-b476f94b9713" xlink:href="sgh-20260227.xsd#sgh_FurnitureFixturesAndSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019b99e9-ee06-73f1-80fc-457492dbff4e" xlink:to="loc_sgh_FurnitureFixturesAndSoftwareMember_019b99e9-ee06-7b8e-9c42-b476f94b9713" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_019b99e9-ee06-743a-84e7-46b4bc085e73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019b99e9-ee06-73f1-80fc-457492dbff4e" xlink:to="loc_us-gaap_LandMember_019b99e9-ee06-743a-84e7-46b4bc085e73" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019b99e9-ee06-714b-8850-8dd4326453dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019b99e9-ee06-75dd-aeec-00d2cf6286b1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019b99e9-ee06-714b-8850-8dd4326453dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019b99e9-ee06-7ee9-92dd-bf87e5dbacf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019b99e9-ee06-75dd-aeec-00d2cf6286b1" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019b99e9-ee06-7ee9-92dd-bf87e5dbacf3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019b99e9-ee06-7c2a-adc8-2929f93b3243" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019b99e9-ee06-75dd-aeec-00d2cf6286b1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019b99e9-ee06-7c2a-adc8-2929f93b3243" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019b99e9-ee06-7c45-98fe-f04b8c02a8a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019b99e9-ee06-75dd-aeec-00d2cf6286b1" xlink:to="loc_us-gaap_Depreciation_019b99e9-ee06-7c45-98fe-f04b8c02a8a4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/IntangibleAssetsandGoodwillScheduleofIntangibleAssetsandGoodwillbySegmentDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#IntangibleAssetsandGoodwillScheduleofIntangibleAssetsandGoodwillbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/IntangibleAssetsandGoodwillScheduleofIntangibleAssetsandGoodwillbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019b99e9-ee06-7ca9-8db5-5c63c9f3032f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019b99e9-ee06-7b93-bc87-06d82e8596d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019b99e9-ee06-7ca9-8db5-5c63c9f3032f" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019b99e9-ee06-7b93-bc87-06d82e8596d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019b99e9-ee06-7d8e-a79e-0bba4e09c978" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019b99e9-ee06-7b93-bc87-06d82e8596d4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019b99e9-ee06-7d8e-a79e-0bba4e09c978" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019b99e9-ee06-7d8e-a79e-0bba4e09c978_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019b99e9-ee06-7d8e-a79e-0bba4e09c978" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019b99e9-ee06-7d8e-a79e-0bba4e09c978_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019b99e9-ee06-7b3d-98ef-30dc8e564ead" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019b99e9-ee06-7d8e-a79e-0bba4e09c978" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019b99e9-ee06-7b3d-98ef-30dc8e564ead" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_019b99e9-ee06-7e10-943a-851e2e6df040" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019b99e9-ee06-7b3d-98ef-30dc8e564ead" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_019b99e9-ee06-7e10-943a-851e2e6df040" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019b99e9-ee06-7d57-be03-d458deb6a8cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019b99e9-ee06-7b3d-98ef-30dc8e564ead" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019b99e9-ee06-7d57-be03-d458deb6a8cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019b99e9-ee06-75ca-be4c-efd4a49e521b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019b99e9-ee06-7b3d-98ef-30dc8e564ead" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019b99e9-ee06-75ca-be4c-efd4a49e521b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019b99e9-ee06-716c-b686-82573f6b9a12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019b99e9-ee06-7b93-bc87-06d82e8596d4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019b99e9-ee06-716c-b686-82573f6b9a12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019b99e9-ee06-716c-b686-82573f6b9a12_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019b99e9-ee06-716c-b686-82573f6b9a12" xlink:to="loc_us-gaap_SegmentDomain_019b99e9-ee06-716c-b686-82573f6b9a12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019b99e9-ee06-787b-8eda-78994178332b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019b99e9-ee06-716c-b686-82573f6b9a12" xlink:to="loc_us-gaap_SegmentDomain_019b99e9-ee06-787b-8eda-78994178332b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_AdvancedComputingSegmentMember_019b99e9-ee06-7b87-a961-be12877c779b" xlink:href="sgh-20260227.xsd#sgh_AdvancedComputingSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019b99e9-ee06-787b-8eda-78994178332b" xlink:to="loc_sgh_AdvancedComputingSegmentMember_019b99e9-ee06-7b87-a961-be12877c779b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_IntegratedMemorySegmentMember_019b99e9-ee06-7a36-b296-3fc2a31d3acd" xlink:href="sgh-20260227.xsd#sgh_IntegratedMemorySegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019b99e9-ee06-787b-8eda-78994178332b" xlink:to="loc_sgh_IntegratedMemorySegmentMember_019b99e9-ee06-7a36-b296-3fc2a31d3acd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019b99e9-ee06-740c-8708-9d8546bc28d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019b99e9-ee06-7ca9-8db5-5c63c9f3032f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019b99e9-ee06-740c-8708-9d8546bc28d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019b99e9-ee06-7321-8333-7fe967143287" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019b99e9-ee06-7ca9-8db5-5c63c9f3032f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019b99e9-ee06-7321-8333-7fe967143287" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019b99e9-ee06-74e5-9c64-99a5a23c1587" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019b99e9-ee06-7ca9-8db5-5c63c9f3032f" xlink:to="loc_us-gaap_Goodwill_019b99e9-ee06-74e5-9c64-99a5a23c1587" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/DebtSummaryofLongTermDebtDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#DebtSummaryofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/DebtSummaryofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7f68-8f22-3edd20ffad73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7459-ad01-650001186adc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7f68-8f22-3edd20ffad73" xlink:to="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7459-ad01-650001186adc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7cd3-9b67-543eb997a99e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7459-ad01-650001186adc" xlink:to="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7cd3-9b67-543eb997a99e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7cd3-9b67-543eb997a99e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7cd3-9b67-543eb997a99e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7cd3-9b67-543eb997a99e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-75b1-ba92-2046e3acea12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7cd3-9b67-543eb997a99e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-75b1-ba92-2046e3acea12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_SeniorNotesDueTwoThousandThirtyMember_019b99e9-eeb8-75ca-8fa1-4d7705030a6e" xlink:href="sgh-20260227.xsd#sgh_SeniorNotesDueTwoThousandThirtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-75b1-ba92-2046e3acea12" xlink:to="loc_sgh_SeniorNotesDueTwoThousandThirtyMember_019b99e9-eeb8-75ca-8fa1-4d7705030a6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember_019b99e9-eeb8-7b0b-b4a3-c79544bf9448" xlink:href="sgh-20260227.xsd#sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-75b1-ba92-2046e3acea12" xlink:to="loc_sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember_019b99e9-eeb8-7b0b-b4a3-c79544bf9448" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember_019b99e9-eeb8-7333-8194-b7698629f8c1" xlink:href="sgh-20260227.xsd#sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-75b1-ba92-2046e3acea12" xlink:to="loc_sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember_019b99e9-eeb8-7333-8194-b7698629f8c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_SeniorNotesDueTwoThousandTwentyFiveMember_019b99e9-eeb8-7d84-8329-d354c5167678" xlink:href="sgh-20260227.xsd#sgh_SeniorNotesDueTwoThousandTwentyFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-75b1-ba92-2046e3acea12" xlink:to="loc_sgh_SeniorNotesDueTwoThousandTwentyFiveMember_019b99e9-eeb8-7d84-8329-d354c5167678" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019b99e9-eeb8-7b72-b66e-e76f54a01b02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7f68-8f22-3edd20ffad73" xlink:to="loc_us-gaap_LongTermDebt_019b99e9-eeb8-7b72-b66e-e76f54a01b02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019b99e9-eeb8-7b8a-80c1-57fad7b8e367" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7f68-8f22-3edd20ffad73" xlink:to="loc_us-gaap_LongTermDebtCurrent_019b99e9-eeb8-7b8a-80c1-57fad7b8e367" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019b99e9-eeb8-7c86-b4bb-986444452e76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7f68-8f22-3edd20ffad73" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019b99e9-eeb8-7c86-b4bb-986444452e76" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/DebtCreditFacilityDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#DebtCreditFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/DebtCreditFacilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7692-82f3-1d9fa5b1bc25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7692-82f3-1d9fa5b1bc25" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019b99e9-eeb8-72bc-981c-d1166f813ac7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7692-82f3-1d9fa5b1bc25" xlink:to="loc_us-gaap_CreditFacilityAxis_019b99e9-eeb8-72bc-981c-d1166f813ac7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019b99e9-eeb8-72bc-981c-d1166f813ac7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019b99e9-eeb8-72bc-981c-d1166f813ac7" xlink:to="loc_us-gaap_CreditFacilityDomain_019b99e9-eeb8-72bc-981c-d1166f813ac7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019b99e9-eeb8-76ac-9588-52bd8d8eb092" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019b99e9-eeb8-72bc-981c-d1166f813ac7" xlink:to="loc_us-gaap_CreditFacilityDomain_019b99e9-eeb8-76ac-9588-52bd8d8eb092" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019b99e9-eeb8-7b6c-97f1-201e8be10c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019b99e9-eeb8-76ac-9588-52bd8d8eb092" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019b99e9-eeb8-7b6c-97f1-201e8be10c0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019b99e9-eeb8-756f-a45c-260466022895" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019b99e9-eeb8-76ac-9588-52bd8d8eb092" xlink:to="loc_us-gaap_LetterOfCreditMember_019b99e9-eeb8-756f-a45c-260466022895" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_CreditFacilityTermLoanMember_019b99e9-eeb8-7475-a6ac-415bf5b365ab" xlink:href="sgh-20260227.xsd#sgh_CreditFacilityTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019b99e9-eeb8-76ac-9588-52bd8d8eb092" xlink:to="loc_sgh_CreditFacilityTermLoanMember_019b99e9-eeb8-7475-a6ac-415bf5b365ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7b13-a6d2-9c5c6203cbd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7692-82f3-1d9fa5b1bc25" xlink:to="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7b13-a6d2-9c5c6203cbd3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7b13-a6d2-9c5c6203cbd3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7b13-a6d2-9c5c6203cbd3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7b13-a6d2-9c5c6203cbd3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-716c-87dc-be21b9f9a200" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7b13-a6d2-9c5c6203cbd3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-716c-87dc-be21b9f9a200" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_A2025CreditAgreementMember_019b99e9-eeb8-73d1-a7f0-d21977141406" xlink:href="sgh-20260227.xsd#sgh_A2025CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-716c-87dc-be21b9f9a200" xlink:to="loc_sgh_A2025CreditAgreementMember_019b99e9-eeb8-73d1-a7f0-d21977141406" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TheCreditFacilityAgreementMember_019b99e9-eeb8-7141-a235-b54cc63465e0" xlink:href="sgh-20260227.xsd#sgh_TheCreditFacilityAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-716c-87dc-be21b9f9a200" xlink:to="loc_sgh_TheCreditFacilityAgreementMember_019b99e9-eeb8-7141-a235-b54cc63465e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_CreditFacilityTermLoanMember_019b99e9-eeb8-7fb2-b3ca-96cf9414db8d" xlink:href="sgh-20260227.xsd#sgh_CreditFacilityTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-716c-87dc-be21b9f9a200" xlink:to="loc_sgh_CreditFacilityTermLoanMember_019b99e9-eeb8-7fb2-b3ca-96cf9414db8d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019b99e9-eeb8-7370-a1cc-cceab9d5ed41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019b99e9-eeb8-7370-a1cc-cceab9d5ed41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_019b99e9-eeb8-7630-8420-0cf92e431f6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_019b99e9-eeb8-7630-8420-0cf92e431f6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019b99e9-eeb8-747a-ab36-cc06dc6bcd25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019b99e9-eeb8-747a-ab36-cc06dc6bcd25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019b99e9-eeb8-756e-af32-572a92c14288" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019b99e9-eeb8-756e-af32-572a92c14288" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019b99e9-eeb8-76ba-b2b9-2c992bb42379" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019b99e9-eeb8-76ba-b2b9-2c992bb42379" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019b99e9-eeb8-729e-b9fc-c0631e66c46a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019b99e9-eeb8-729e-b9fc-c0631e66c46a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_019b99e9-eeb8-7ef4-9bba-3c4a34cac759" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_019b99e9-eeb8-7ef4-9bba-3c4a34cac759" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019b99e9-eeb8-7368-9837-1b04913f0027" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7193-8087-75d9989abe6a" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019b99e9-eeb8-7368-9837-1b04913f0027" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/DebtConvertibleSeniorNotesDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#DebtConvertibleSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/DebtConvertibleSeniorNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-716a-9cb3-414f71c4d285" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7b94-a965-80f0eef1950c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-716a-9cb3-414f71c4d285" xlink:to="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7b94-a965-80f0eef1950c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7126-bdd0-f2b865dd08fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7b94-a965-80f0eef1950c" xlink:to="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7126-bdd0-f2b865dd08fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7126-bdd0-f2b865dd08fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7126-bdd0-f2b865dd08fe" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7126-bdd0-f2b865dd08fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7bfa-aaa5-35fed4cd0618" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7126-bdd0-f2b865dd08fe" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7bfa-aaa5-35fed4cd0618" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember_019b99e9-eeb8-793b-bf9d-bfc57f66d6f9" xlink:href="sgh-20260227.xsd#sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7bfa-aaa5-35fed4cd0618" xlink:to="loc_sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember_019b99e9-eeb8-793b-bf9d-bfc57f66d6f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember_019b99e9-eeb8-74e5-8c39-d0cc7c86799d" xlink:href="sgh-20260227.xsd#sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7bfa-aaa5-35fed4cd0618" xlink:to="loc_sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember_019b99e9-eeb8-74e5-8c39-d0cc7c86799d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TwoPercentConvertibleSeniorNotesDue2030Member_019b99e9-eeb8-7522-8af3-6052b13b2159" xlink:href="sgh-20260227.xsd#sgh_TwoPercentConvertibleSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7bfa-aaa5-35fed4cd0618" xlink:to="loc_sgh_TwoPercentConvertibleSeniorNotesDue2030Member_019b99e9-eeb8-7522-8af3-6052b13b2159" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_SeniorNotesDueTwoThousandThirtyMember_019b99e9-eeb8-7551-bd6b-2ba1fb59a5f3" xlink:href="sgh-20260227.xsd#sgh_SeniorNotesDueTwoThousandThirtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7bfa-aaa5-35fed4cd0618" xlink:to="loc_sgh_SeniorNotesDueTwoThousandThirtyMember_019b99e9-eeb8-7551-bd6b-2ba1fb59a5f3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019cf96f-0a8c-7f60-aff9-d30408f57c7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-716a-9cb3-414f71c4d285" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019cf96f-0a8c-7f60-aff9-d30408f57c7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019d25e2-57e3-7bbe-961b-9051f432d60c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-716a-9cb3-414f71c4d285" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019d25e2-57e3-7bbe-961b-9051f432d60c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019b99e9-eeb8-78d0-9241-8e4595416e26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-716a-9cb3-414f71c4d285" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019b99e9-eeb8-78d0-9241-8e4595416e26" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019b99e9-eeb8-7541-8854-9d8c0aabe8b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-716a-9cb3-414f71c4d285" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019b99e9-eeb8-7541-8854-9d8c0aabe8b4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/DebtInterestExpenseDisclosureDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#DebtInterestExpenseDisclosureDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/DebtInterestExpenseDisclosureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7a59-8818-1d14b2273746" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7d32-b765-45186ccb8ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7a59-8818-1d14b2273746" xlink:to="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7d32-b765-45186ccb8ef7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7047-9268-75e8491151e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019b99e9-eeb8-7d32-b765-45186ccb8ef7" xlink:to="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7047-9268-75e8491151e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7047-9268-75e8491151e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7047-9268-75e8491151e5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7047-9268-75e8491151e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-780a-ad6b-89272d171304" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7047-9268-75e8491151e5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-780a-ad6b-89272d171304" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_ConvertibleNotesMember_019b99e9-eeb8-78a6-86bd-77d291b5a27b" xlink:href="sgh-20260227.xsd#sgh_ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-780a-ad6b-89272d171304" xlink:to="loc_sgh_ConvertibleNotesMember_019b99e9-eeb8-78a6-86bd-77d291b5a27b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember_019b99e9-eeb8-7532-8aa0-29dddf756187" xlink:href="sgh-20260227.xsd#sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-780a-ad6b-89272d171304" xlink:to="loc_sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember_019b99e9-eeb8-7532-8aa0-29dddf756187" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019b99e9-eeb8-71cb-b155-50117c663d64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7a59-8818-1d14b2273746" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019b99e9-eeb8-71cb-b155-50117c663d64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019b99e9-eeb8-76e5-9e8f-67289e0ec544" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7a59-8818-1d14b2273746" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019b99e9-eeb8-76e5-9e8f-67289e0ec544" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019b99e9-eeb8-7f5d-9e77-35fea83e0223" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019b99e9-eeb8-7a59-8818-1d14b2273746" xlink:to="loc_us-gaap_InterestExpenseDebt_019b99e9-eeb8-7f5d-9e77-35fea83e0223" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019b99e9-eeb8-70a5-92b7-c6aa32eccd38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019b99e9-eeb8-7ab2-b242-a00e4bdc2e1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019b99e9-eeb8-70a5-92b7-c6aa32eccd38" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019b99e9-eeb8-7ab2-b242-a00e4bdc2e1c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019b99e9-eeb8-7f05-9017-d99134144397" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019b99e9-eeb8-7ab2-b242-a00e4bdc2e1c" xlink:to="loc_srt_RangeAxis_019b99e9-eeb8-7f05-9017-d99134144397" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019b99e9-eeb8-7f05-9017-d99134144397_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019b99e9-eeb8-7f05-9017-d99134144397" xlink:to="loc_srt_RangeMember_019b99e9-eeb8-7f05-9017-d99134144397_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019b99e9-eeb8-7bed-a075-a1b3a29fe582" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019b99e9-eeb8-7f05-9017-d99134144397" xlink:to="loc_srt_RangeMember_019b99e9-eeb8-7bed-a075-a1b3a29fe582" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019b99e9-eeb8-71a6-971a-56c7c0efdce4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019b99e9-eeb8-7bed-a075-a1b3a29fe582" xlink:to="loc_srt_MinimumMember_019b99e9-eeb8-71a6-971a-56c7c0efdce4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019b99e9-eeb8-7bbd-a930-4d6dfacb71b0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019b99e9-eeb8-7bed-a075-a1b3a29fe582" xlink:to="loc_srt_MaximumMember_019b99e9-eeb8-7bbd-a930-4d6dfacb71b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_019b99e9-eeb8-7356-9530-c856a1ba0a7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019b99e9-eeb8-70a5-92b7-c6aa32eccd38" xlink:to="loc_us-gaap_OperatingLeasePayments_019b99e9-eeb8-7356-9530-c856a1ba0a7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019b99e9-eeb8-7c53-8ca4-f6b9b688ac92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019b99e9-eeb8-70a5-92b7-c6aa32eccd38" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019b99e9-eeb8-7c53-8ca4-f6b9b688ac92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019b99e9-eeb8-78c3-a93e-e0df64572c4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019b99e9-eeb8-70a5-92b7-c6aa32eccd38" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019b99e9-eeb8-78c3-a93e-e0df64572c4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019b99e9-eeb8-73cb-930c-e2b6af2bda04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019b99e9-eeb8-70a5-92b7-c6aa32eccd38" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019b99e9-eeb8-73cb-930c-e2b6af2bda04" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/TemporaryEquityDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#TemporaryEquityDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/TemporaryEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-7d2f-8d32-24a619839079" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-7d2f-8d32-24a619839079" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019b99e9-eeb8-73fd-a46c-93ccf6bc5b9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-7d2f-8d32-24a619839079" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019b99e9-eeb8-73fd-a46c-93ccf6bc5b9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-73fd-a46c-93ccf6bc5b9a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019b99e9-eeb8-73fd-a46c-93ccf6bc5b9a" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-73fd-a46c-93ccf6bc5b9a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-7fb2-bac5-dbc029086f89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019b99e9-eeb8-73fd-a46c-93ccf6bc5b9a" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-7fb2-bac5-dbc029086f89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivatePlacementMember_019b99e9-eeb8-7b80-a8db-faa3299504bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-7fb2-bac5-dbc029086f89" xlink:to="loc_us-gaap_PrivatePlacementMember_019b99e9-eeb8-7b80-a8db-faa3299504bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019b99e9-eeb8-77dd-8294-c0831f352851" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-7d2f-8d32-24a619839079" xlink:to="loc_srt_RangeAxis_019b99e9-eeb8-77dd-8294-c0831f352851" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019b99e9-eeb8-77dd-8294-c0831f352851_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019b99e9-eeb8-77dd-8294-c0831f352851" xlink:to="loc_srt_RangeMember_019b99e9-eeb8-77dd-8294-c0831f352851_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019b99e9-eeb8-76ce-9783-505f1a1f639b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019b99e9-eeb8-77dd-8294-c0831f352851" xlink:to="loc_srt_RangeMember_019b99e9-eeb8-76ce-9783-505f1a1f639b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019b99e9-eeb8-786d-b46f-2fc098a78672" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019b99e9-eeb8-76ce-9783-505f1a1f639b" xlink:to="loc_srt_MinimumMember_019b99e9-eeb8-786d-b46f-2fc098a78672" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019b99e9-eeb8-764d-94cd-2595261bc5e3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019b99e9-eeb8-76ce-9783-505f1a1f639b" xlink:to="loc_srt_MaximumMember_019b99e9-eeb8-764d-94cd-2595261bc5e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019b99e9-eeb8-724b-93f3-3a4fb90a72c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019b99e9-eeb8-724b-93f3-3a4fb90a72c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019b99e9-eeb8-70b4-ac70-d23cd97dcd5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019b99e9-eeb8-70b4-ac70-d23cd97dcd5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019b99e9-eeb8-7e7c-9036-b0682ade9162" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019b99e9-eeb8-7e7c-9036-b0682ade9162" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019b99e9-eeb8-78e5-9257-e567aa01bbf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019b99e9-eeb8-78e5-9257-e567aa01bbf9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_019b99e9-eeb8-7806-b4f5-d2ff511b33e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_019b99e9-eeb8-7806-b4f5-d2ff511b33e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_SaleOfStockConvertibleThresholdConsecutiveTradingDays_019b99e9-eeb8-7440-a6f7-cf4e243feb12" xlink:href="sgh-20260227.xsd#sgh_SaleOfStockConvertibleThresholdConsecutiveTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_sgh_SaleOfStockConvertibleThresholdConsecutiveTradingDays_019b99e9-eeb8-7440-a6f7-cf4e243feb12" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_PreferredStockConvertibleConversionPriceThresholdPercentage_019b99e9-eeb8-79f1-a24c-4a0edacae214" xlink:href="sgh-20260227.xsd#sgh_PreferredStockConvertibleConversionPriceThresholdPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_sgh_PreferredStockConvertibleConversionPriceThresholdPercentage_019b99e9-eeb8-79f1-a24c-4a0edacae214" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockConvertibleConversionPrice_019b99e9-eeb8-7315-8bb6-5d7949ae9655" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockConvertibleConversionPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_PreferredStockConvertibleConversionPrice_019b99e9-eeb8-7315-8bb6-5d7949ae9655" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_019b99e9-eeb8-7687-96a3-00f36f9bdeea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_019b99e9-eeb8-7687-96a3-00f36f9bdeea" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019b99e9-eeb8-77e7-871b-6162aa1cc67a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019b99e9-eeb8-77e7-871b-6162aa1cc67a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019b99e9-eeb8-72e0-80e0-caad0795caf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019b99e9-eeb8-72e0-80e0-caad0795caf6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_NumberOfDirectorNomineesLowerRange_019b99e9-eeb8-7b47-9e6d-c3fdf6873b56" xlink:href="sgh-20260227.xsd#sgh_NumberOfDirectorNomineesLowerRange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_sgh_NumberOfDirectorNomineesLowerRange_019b99e9-eeb8-7b47-9e6d-c3fdf6873b56" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_NumberOfDirectorNomineesUpperRange_019b99e9-eeb8-75bc-beab-df69f5a26d4a" xlink:href="sgh-20260227.xsd#sgh_NumberOfDirectorNomineesUpperRange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_sgh_NumberOfDirectorNomineesUpperRange_019b99e9-eeb8-75bc-beab-df69f5a26d4a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TemporaryEquityRedemptionRightsNumberOfInstallments_019b99e9-eeb8-79f0-87ee-516b4ec0b99c" xlink:href="sgh-20260227.xsd#sgh_TemporaryEquityRedemptionRightsNumberOfInstallments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_sgh_TemporaryEquityRedemptionRightsNumberOfInstallments_019b99e9-eeb8-79f0-87ee-516b4ec0b99c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TemporaryEquityRedemptionRightsNoticePeriod_019b99e9-eeb8-7c31-bf10-886fedad13e4" xlink:href="sgh-20260227.xsd#sgh_TemporaryEquityRedemptionRightsNoticePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-704a-946d-41154f05a08e" xlink:to="loc_sgh_TemporaryEquityRedemptionRightsNoticePeriod_019b99e9-eeb8-7c31-bf10-886fedad13e4" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/EquityNarrativeDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#EquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/EquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-7297-a898-0737efc851f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-7836-854e-1fd9dafb37a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-7297-a898-0737efc851f0" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-7836-854e-1fd9dafb37a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019b99e9-eeb8-705c-b937-b1350f86d3cb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-7836-854e-1fd9dafb37a0" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019b99e9-eeb8-705c-b937-b1350f86d3cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019b99e9-eeb8-705c-b937-b1350f86d3cb_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019b99e9-eeb8-705c-b937-b1350f86d3cb" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019b99e9-eeb8-705c-b937-b1350f86d3cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019b99e9-eeb8-79c0-b559-a2112f374b88" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019b99e9-eeb8-705c-b937-b1350f86d3cb" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019b99e9-eeb8-79c0-b559-a2112f374b88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_ShareRepurchaseAuthorizationMember_019b99e9-eeb8-7640-b5ed-7c78ff4e9dea" xlink:href="sgh-20260227.xsd#sgh_ShareRepurchaseAuthorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019b99e9-eeb8-79c0-b559-a2112f374b88" xlink:to="loc_sgh_ShareRepurchaseAuthorizationMember_019b99e9-eeb8-7640-b5ed-7c78ff4e9dea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_StockRepurchasePrograms2024And2025Member_019b99e9-eeb8-775b-8607-6433189702f4" xlink:href="sgh-20260227.xsd#sgh_StockRepurchasePrograms2024And2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019b99e9-eeb8-79c0-b559-a2112f374b88" xlink:to="loc_sgh_StockRepurchasePrograms2024And2025Member_019b99e9-eeb8-775b-8607-6433189702f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_InitialAuthorizationMember_019b99e9-eeb8-794a-9552-43e45084b810" xlink:href="sgh-20260227.xsd#sgh_InitialAuthorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019b99e9-eeb8-79c0-b559-a2112f374b88" xlink:to="loc_sgh_InitialAuthorizationMember_019b99e9-eeb8-794a-9552-43e45084b810" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_SilverLakePartnersRepurchase1Member_019b99e9-eeb8-7b28-bc1a-90ee9f2c4869" xlink:href="sgh-20260227.xsd#sgh_SilverLakePartnersRepurchase1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019b99e9-eeb8-79c0-b559-a2112f374b88" xlink:to="loc_sgh_SilverLakePartnersRepurchase1Member_019b99e9-eeb8-7b28-bc1a-90ee9f2c4869" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019b99e9-eeb8-7692-a3b6-d35bf064f821" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-7297-a898-0737efc851f0" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019b99e9-eeb8-7692-a3b6-d35bf064f821" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_019b99e9-eeb8-755e-82c8-92442d439215" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-7297-a898-0737efc851f0" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_019b99e9-eeb8-755e-82c8-92442d439215" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_019b99e9-eeb8-7a5f-ac4d-641d1bece645" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-7297-a898-0737efc851f0" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_019b99e9-eeb8-7a5f-ac4d-641d1bece645" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019b99e9-eeb8-79a5-81f7-028b1c558062" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019b99e9-eeb8-7297-a898-0737efc851f0" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019b99e9-eeb8-79a5-81f7-028b1c558062" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/EquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#EquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/EquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019b99e9-eeb8-7315-b77f-53e77454af12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-73e5-ab82-f7c414090956" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019b99e9-eeb8-7315-b77f-53e77454af12" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-73e5-ab82-f7c414090956" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019b99e9-eeb8-7a58-9043-66d417681e62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019b99e9-eeb8-73e5-ab82-f7c414090956" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019b99e9-eeb8-7a58-9043-66d417681e62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019b99e9-eeb8-7a58-9043-66d417681e62_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019b99e9-eeb8-7a58-9043-66d417681e62" xlink:to="loc_us-gaap_EquityComponentDomain_019b99e9-eeb8-7a58-9043-66d417681e62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019b99e9-eeb8-7552-ba2e-a2ac3632d83e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019b99e9-eeb8-7a58-9043-66d417681e62" xlink:to="loc_us-gaap_EquityComponentDomain_019b99e9-eeb8-7552-ba2e-a2ac3632d83e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember_019b99e9-eeb8-74fc-a7f4-c45519c36a54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019b99e9-eeb8-7552-ba2e-a2ac3632d83e" xlink:to="loc_us-gaap_AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember_019b99e9-eeb8-74fc-a7f4-c45519c36a54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019b99e9-eeb8-79c7-abef-ebec702dea5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019b99e9-eeb8-7315-b77f-53e77454af12" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019b99e9-eeb8-79c7-abef-ebec702dea5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019b99e9-eeb8-7aa4-b427-70590003869d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019b99e9-eeb8-79c7-abef-ebec702dea5c" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019b99e9-eeb8-7aa4-b427-70590003869d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019b99e9-eeb8-729a-8a7e-aced0dad5eb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019b99e9-eeb8-79c7-abef-ebec702dea5c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019b99e9-eeb8-729a-8a7e-aced0dad5eb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019b99e9-eeb8-72b3-b112-d46f95e48c29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019b99e9-eeb8-79c7-abef-ebec702dea5c" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019b99e9-eeb8-72b3-b112-d46f95e48c29" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019b99e9-eeb8-70c0-bbd8-a35ab1c99497" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019b99e9-eeb8-79c7-abef-ebec702dea5c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019b99e9-eeb8-70c0-bbd8-a35ab1c99497" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019b99e9-eeb8-770c-af71-86da355b9ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/FairValueMeasurementsScheduleofFairValueMeasurementsofOtherAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#FairValueMeasurementsScheduleofFairValueMeasurementsofOtherAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/FairValueMeasurementsScheduleofFairValueMeasurementsofOtherAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019b99e9-eeb8-77ce-86d5-942f1acc920e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-7d21-8e81-879acee2ed96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019b99e9-eeb8-77ce-86d5-942f1acc920e" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-7d21-8e81-879acee2ed96" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019b99e9-eeb8-7311-9460-8033c5b191a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-7d21-8e81-879acee2ed96" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019b99e9-eeb8-7311-9460-8033c5b191a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019b99e9-eeb8-7311-9460-8033c5b191a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019b99e9-eeb8-7311-9460-8033c5b191a5" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019b99e9-eeb8-7311-9460-8033c5b191a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019b99e9-eeb8-799b-a37c-c41bd1f1a05f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019b99e9-eeb8-7311-9460-8033c5b191a5" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019b99e9-eeb8-799b-a37c-c41bd1f1a05f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019b99e9-eeb8-7d0f-8637-ceb8ab34cfdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019b99e9-eeb8-799b-a37c-c41bd1f1a05f" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019b99e9-eeb8-7d0f-8637-ceb8ab34cfdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019b99e9-eeb8-7b82-ac9d-036555ff625f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019b99e9-eeb8-7d0f-8637-ceb8ab34cfdb" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019b99e9-eeb8-7b82-ac9d-036555ff625f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019b99e9-eeb8-7a14-a0c5-1b170dbbed89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019b99e9-eeb8-7d0f-8637-ceb8ab34cfdb" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019b99e9-eeb8-7a14-a0c5-1b170dbbed89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019b99e9-eeb8-71e3-930c-0635b980a3cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-7d21-8e81-879acee2ed96" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019b99e9-eeb8-71e3-930c-0635b980a3cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-eeb8-71e3-930c-0635b980a3cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019b99e9-eeb8-71e3-930c-0635b980a3cd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-eeb8-71e3-930c-0635b980a3cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-eeb8-7c61-b4ec-321cfe6611bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019b99e9-eeb8-71e3-930c-0635b980a3cd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-eeb8-7c61-b4ec-321cfe6611bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019b99e9-eeb8-7b42-b3fa-313921d668d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019b99e9-eeb8-7c61-b4ec-321cfe6611bc" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019b99e9-eeb8-7b42-b3fa-313921d668d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7edc-bf38-6c52c5b11f93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-7d21-8e81-879acee2ed96" xlink:to="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7edc-bf38-6c52c5b11f93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7edc-bf38-6c52c5b11f93_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7edc-bf38-6c52c5b11f93" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-7edc-bf38-6c52c5b11f93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-70df-988e-68452d097c89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019b99e9-eeb8-7edc-bf38-6c52c5b11f93" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-70df-988e-68452d097c89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_SeniorNotesDueTwoThousandThirtyMember_019b99e9-eeb8-7322-8d01-a27c743e45fc" xlink:href="sgh-20260227.xsd#sgh_SeniorNotesDueTwoThousandThirtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-70df-988e-68452d097c89" xlink:to="loc_sgh_SeniorNotesDueTwoThousandThirtyMember_019b99e9-eeb8-7322-8d01-a27c743e45fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember_019b99e9-eeb8-79d7-8435-f7dd635271cf" xlink:href="sgh-20260227.xsd#sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-70df-988e-68452d097c89" xlink:to="loc_sgh_TwoPercentConvertibleSeniorNotesDueTwoThousandTwentyNineMember_019b99e9-eeb8-79d7-8435-f7dd635271cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember_019b99e9-eeb8-784c-ab18-5c0275048901" xlink:href="sgh-20260227.xsd#sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019b99e9-eeb8-70df-988e-68452d097c89" xlink:to="loc_sgh_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember_019b99e9-eeb8-784c-ab18-5c0275048901" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_019b99e9-eeb8-7d66-bd92-91739cd1826d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019b99e9-eeb8-77ce-86d5-942f1acc920e" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_019b99e9-eeb8-7d66-bd92-91739cd1826d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019b99e9-eeb8-7704-a0b1-30a7baa04ef9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019b99e9-eeb8-7d66-bd92-91739cd1826d" xlink:to="loc_us-gaap_DerivativeAssets_019b99e9-eeb8-7704-a0b1-30a7baa04ef9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019b99e9-eeb8-7216-9af6-226981b8cadd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssets_019b99e9-eeb8-7704-a0b1-30a7baa04ef9" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019b99e9-eeb8-7216-9af6-226981b8cadd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_019b99e9-eeb8-7aea-9a93-0bda59da7656" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019b99e9-eeb8-77ce-86d5-942f1acc920e" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_019b99e9-eeb8-7aea-9a93-0bda59da7656" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019b99e9-eeb8-7527-b780-c019a412871d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019b99e9-eeb8-7aea-9a93-0bda59da7656" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019b99e9-eeb8-7527-b780-c019a412871d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019b99e9-eeb8-73cf-8eb9-0f5c0052e6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-79c0-9b59-3f467aed3da3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019b99e9-eeb8-73cf-8eb9-0f5c0052e6b9" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-79c0-9b59-3f467aed3da3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019b99e9-eeb8-72e1-92b4-04196e8a1e83" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-79c0-9b59-3f467aed3da3" xlink:to="loc_srt_OwnershipAxis_019b99e9-eeb8-72e1-92b4-04196e8a1e83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019b99e9-eeb8-72e1-92b4-04196e8a1e83_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019b99e9-eeb8-72e1-92b4-04196e8a1e83" xlink:to="loc_srt_OwnershipDomain_019b99e9-eeb8-72e1-92b4-04196e8a1e83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019b99e9-eeb8-759b-a268-7458ea666f8c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019b99e9-eeb8-72e1-92b4-04196e8a1e83" xlink:to="loc_srt_OwnershipDomain_019b99e9-eeb8-759b-a268-7458ea666f8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_SMARTBrazilMember_019b99e9-eeb8-7c2b-85b6-8eabc7f97517" xlink:href="sgh-20260227.xsd#sgh_SMARTBrazilMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019b99e9-eeb8-759b-a268-7458ea666f8c" xlink:to="loc_sgh_SMARTBrazilMember_019b99e9-eeb8-7c2b-85b6-8eabc7f97517" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019b99e9-eeb8-712e-b3f1-0469b5ee8701" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019b99e9-eeb8-79c0-9b59-3f467aed3da3" xlink:to="loc_dei_LegalEntityAxis_019b99e9-eeb8-712e-b3f1-0469b5ee8701" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019b99e9-eeb8-712e-b3f1-0469b5ee8701_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019b99e9-eeb8-712e-b3f1-0469b5ee8701" xlink:to="loc_dei_EntityDomain_019b99e9-eeb8-712e-b3f1-0469b5ee8701_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019b99e9-eeb8-70ee-9df2-3802a4e8d6f4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019b99e9-eeb8-712e-b3f1-0469b5ee8701" xlink:to="loc_dei_EntityDomain_019b99e9-eeb8-70ee-9df2-3802a4e8d6f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_LexarEuropeBVMember_019b99e9-eeb8-784c-898b-7f7e90e58b4d" xlink:href="sgh-20260227.xsd#sgh_LexarEuropeBVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019b99e9-eeb8-70ee-9df2-3802a4e8d6f4" xlink:to="loc_sgh_LexarEuropeBVMember_019b99e9-eeb8-784c-898b-7f7e90e58b4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_StockRepurchaseAgreementOwnershipRightsPercent_019b99e9-eeb8-7767-a058-43f336024532" xlink:href="sgh-20260227.xsd#sgh_StockRepurchaseAgreementOwnershipRightsPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019b99e9-eeb8-73cf-8eb9-0f5c0052e6b9" xlink:to="loc_sgh_StockRepurchaseAgreementOwnershipRightsPercent_019b99e9-eeb8-7767-a058-43f336024532" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/EquityPlansNarrativeDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#EquityPlansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/EquityPlansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7716-9b85-598c007c0041" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-7824-8d8d-cdfc46273383" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7716-9b85-598c007c0041" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-7824-8d8d-cdfc46273383" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019b99e9-eeb8-7f31-ac34-d9c44730cc9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-7824-8d8d-cdfc46273383" xlink:to="loc_us-gaap_AwardTypeAxis_019b99e9-eeb8-7f31-ac34-d9c44730cc9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7f31-ac34-d9c44730cc9b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019b99e9-eeb8-7f31-ac34-d9c44730cc9b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7f31-ac34-d9c44730cc9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7ddc-9277-b41ff06bc9d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019b99e9-eeb8-7f31-ac34-d9c44730cc9b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7ddc-9277-b41ff06bc9d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_RestrictedStockAwardsAndRestrictedStockUnitsMember_019b99e9-eeb8-71e9-b154-b7cff26236a8" xlink:href="sgh-20260227.xsd#sgh_RestrictedStockAwardsAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7ddc-9277-b41ff06bc9d2" xlink:to="loc_sgh_RestrictedStockAwardsAndRestrictedStockUnitsMember_019b99e9-eeb8-71e9-b154-b7cff26236a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019b99e9-eeb8-7cc5-a594-610e532dc707" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-7824-8d8d-cdfc46273383" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019b99e9-eeb8-7cc5-a594-610e532dc707" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-7cc5-a594-610e532dc707_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019b99e9-eeb8-7cc5-a594-610e532dc707" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-7cc5-a594-610e532dc707_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-7c5d-9275-1a12e499247b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019b99e9-eeb8-7cc5-a594-610e532dc707" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-7c5d-9275-1a12e499247b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019b99e9-eeb8-7840-baba-404d0e3529ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019b99e9-eeb8-7c5d-9275-1a12e499247b" xlink:to="loc_us-gaap_EmployeeStockMember_019b99e9-eeb8-7840-baba-404d0e3529ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019b99e9-eeb8-7126-8451-9499c2c9e397" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7716-9b85-598c007c0041" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019b99e9-eeb8-7126-8451-9499c2c9e397" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019b99e9-eeb8-7137-89b2-444de7114a82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7716-9b85-598c007c0041" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019b99e9-eeb8-7137-89b2-444de7114a82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019b99e9-eeb8-7d5e-9d4a-37ab10758b5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7716-9b85-598c007c0041" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019b99e9-eeb8-7d5e-9d4a-37ab10758b5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019b99e9-eeb8-7720-8a87-4db0b91dfb92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7716-9b85-598c007c0041" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019b99e9-eeb8-7720-8a87-4db0b91dfb92" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_019b99e9-eeb8-728d-a761-f0740f811769" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7716-9b85-598c007c0041" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_019b99e9-eeb8-728d-a761-f0740f811769" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019b99e9-eeb8-76b9-9b79-f1040a460fcc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7716-9b85-598c007c0041" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019b99e9-eeb8-76b9-9b79-f1040a460fcc" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/EquityPlansSummaryofAggregateRestrictedAwardActivityandAssumptionsDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#EquityPlansSummaryofAggregateRestrictedAwardActivityandAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/EquityPlansSummaryofAggregateRestrictedAwardActivityandAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7a3f-bbd9-9e2598194b3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-72b0-93c7-5fc974f901c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7a3f-bbd9-9e2598194b3a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-72b0-93c7-5fc974f901c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019b99e9-eeb8-7a35-b252-cf8577500fbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-72b0-93c7-5fc974f901c6" xlink:to="loc_us-gaap_AwardTypeAxis_019b99e9-eeb8-7a35-b252-cf8577500fbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7a35-b252-cf8577500fbb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019b99e9-eeb8-7a35-b252-cf8577500fbb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7a35-b252-cf8577500fbb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7361-abbe-f0cdd4e16bc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019b99e9-eeb8-7a35-b252-cf8577500fbb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7361-abbe-f0cdd4e16bc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_RestrictedStockAwardsAndRestrictedStockUnitsMember_019b99e9-eeb8-76be-8275-86ae97c838ab" xlink:href="sgh-20260227.xsd#sgh_RestrictedStockAwardsAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019b99e9-eeb8-7361-abbe-f0cdd4e16bc1" xlink:to="loc_sgh_RestrictedStockAwardsAndRestrictedStockUnitsMember_019b99e9-eeb8-76be-8275-86ae97c838ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019b99e9-eeb8-7d5b-bab6-37a02490ef08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7a3f-bbd9-9e2598194b3a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019b99e9-eeb8-7d5b-bab6-37a02490ef08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019b99e9-eeb8-730a-af43-8b0766171ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7a3f-bbd9-9e2598194b3a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019b99e9-eeb8-730a-af43-8b0766171ee6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_019b99e9-eeb8-7668-99aa-6d9508048491" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7a3f-bbd9-9e2598194b3a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_019b99e9-eeb8-7668-99aa-6d9508048491" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/EquityPlansSummaryofSharebasedCompensationExpenseDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#EquityPlansSummaryofSharebasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/EquityPlansSummaryofSharebasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7c1e-a4ee-a2ed6e4f93fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-7d75-9677-1ae159a7e423" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7c1e-a4ee-a2ed6e4f93fd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-7d75-9677-1ae159a7e423" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019b99e9-eeb8-7441-ae42-30c350b82a9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019b99e9-eeb8-7d75-9677-1ae159a7e423" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019b99e9-eeb8-7441-ae42-30c350b82a9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019b99e9-eeb8-7441-ae42-30c350b82a9c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019b99e9-eeb8-7441-ae42-30c350b82a9c" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019b99e9-eeb8-7441-ae42-30c350b82a9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019b99e9-eeb8-7f82-b641-9ec10dcdd776" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019b99e9-eeb8-7441-ae42-30c350b82a9c" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019b99e9-eeb8-7f82-b641-9ec10dcdd776" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019b99e9-eeb8-7c83-8957-6cb9a78ae4b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019b99e9-eeb8-7f82-b641-9ec10dcdd776" xlink:to="loc_us-gaap_CostOfSalesMember_019b99e9-eeb8-7c83-8957-6cb9a78ae4b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019b99e9-eeb8-777d-aa18-ca82bad86e5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019b99e9-eeb8-7f82-b641-9ec10dcdd776" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019b99e9-eeb8-777d-aa18-ca82bad86e5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019b99e9-eeb8-7767-837b-605c25dfd92c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019b99e9-eeb8-7f82-b641-9ec10dcdd776" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019b99e9-eeb8-7767-837b-605c25dfd92c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019b99e9-eeb8-7c0c-b737-abf9c3376d2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019b99e9-eeb8-7c1e-a4ee-a2ed6e4f93fd" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019b99e9-eeb8-7c0c-b737-abf9c3376d2a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/RevenueandCustomerContractBalancesNarrativeDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#RevenueandCustomerContractBalancesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/RevenueandCustomerContractBalancesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019b99e9-eeb8-74a3-996c-8c28e0e1dbf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019b99e9-eeb8-74a3-996c-8c28e0e1dbf4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019b99e9-eeb8-79e8-97ce-09f24abfbc05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019b99e9-eeb8-74a3-996c-8c28e0e1dbf4" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019b99e9-eeb8-79e8-97ce-09f24abfbc05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019b99e9-eeb8-7276-b692-ede89d5c89a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019b99e9-eeb8-7276-b692-ede89d5c89a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019b99e9-eeb8-759f-a89a-686976f0eef5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019b99e9-eeb8-759f-a89a-686976f0eef5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019b99e9-eeb8-7625-94e0-0632eeb9d857" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019b99e9-eeb8-7625-94e0-0632eeb9d857" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRefundLiabilityCurrent_019b99e9-eeb8-794b-8713-2349aaedb60d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRefundLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_CustomerRefundLiabilityCurrent_019b99e9-eeb8-794b-8713-2349aaedb60d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_ContractWithCustomerLiabilityRevenueRecognizedCustomerAdvances_019b99e9-eeb8-737a-ba7c-6d8b938000e0" xlink:href="sgh-20260227.xsd#sgh_ContractWithCustomerLiabilityRevenueRecognizedCustomerAdvances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_sgh_ContractWithCustomerLiabilityRevenueRecognizedCustomerAdvances_019b99e9-eeb8-737a-ba7c-6d8b938000e0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerRefundLiability_019b99e9-eeb8-704c-8e52-542d9d93b923" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerRefundLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_ContractWithCustomerRefundLiability_019b99e9-eeb8-704c-8e52-542d9d93b923" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/RevenueandCustomerContractBalancesNarrativeDetails_1" xlink:type="simple" xlink:href="sgh-20260227.xsd#RevenueandCustomerContractBalancesNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/RevenueandCustomerContractBalancesNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019b99e9-eeb8-74a3-996c-8c28e0e1dbf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019b99e9-eeb8-74a3-996c-8c28e0e1dbf4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019b99e9-eeb8-7276-b692-ede89d5c89a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019b99e9-eeb8-7276-b692-ede89d5c89a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019b99e9-eeb8-759f-a89a-686976f0eef5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019b99e9-eeb8-759f-a89a-686976f0eef5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019b99e9-eeb8-7625-94e0-0632eeb9d857" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019b99e9-eeb8-7625-94e0-0632eeb9d857" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRefundLiabilityCurrent_019b99e9-eeb8-794b-8713-2349aaedb60d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRefundLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_CustomerRefundLiabilityCurrent_019b99e9-eeb8-794b-8713-2349aaedb60d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_ContractWithCustomerLiabilityRevenueRecognizedCustomerAdvances_019b99e9-eeb8-737a-ba7c-6d8b938000e0" xlink:href="sgh-20260227.xsd#sgh_ContractWithCustomerLiabilityRevenueRecognizedCustomerAdvances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_sgh_ContractWithCustomerLiabilityRevenueRecognizedCustomerAdvances_019b99e9-eeb8-737a-ba7c-6d8b938000e0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerRefundLiability_019b99e9-eeb8-704c-8e52-542d9d93b923" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerRefundLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019b99e9-eeb8-7919-90cb-c5acc8d6daa7" xlink:to="loc_us-gaap_ContractWithCustomerRefundLiability_019b99e9-eeb8-704c-8e52-542d9d93b923" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/EarningsPerShareDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#EarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/EarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019b99e9-eeb9-72cc-9771-893c13202f87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019b99e9-eeb9-72cc-9771-893c13202f87" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019b99e9-eeb9-71e2-8a76-7b791d08d000" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019b99e9-eeb9-72cc-9771-893c13202f87" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019b99e9-eeb9-71e2-8a76-7b791d08d000" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019b99e9-eeb9-71e2-8a76-7b791d08d000_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019b99e9-eeb9-71e2-8a76-7b791d08d000" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019b99e9-eeb9-71e2-8a76-7b791d08d000_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019b99e9-eeb9-79a8-aadc-c1e1e31c1aba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019b99e9-eeb9-71e2-8a76-7b791d08d000" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019b99e9-eeb9-79a8-aadc-c1e1e31c1aba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_EquityPlansMember_019b99e9-eeb9-7fc4-b532-c997b178d05b" xlink:href="sgh-20260227.xsd#sgh_EquityPlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019b99e9-eeb9-79a8-aadc-c1e1e31c1aba" xlink:to="loc_sgh_EquityPlansMember_019b99e9-eeb9-7fc4-b532-c997b178d05b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_ConvertibleNotesMember_019b99e9-eeb9-70db-abcd-644e1f802571" xlink:href="sgh-20260227.xsd#sgh_ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019b99e9-eeb9-79a8-aadc-c1e1e31c1aba" xlink:to="loc_sgh_ConvertibleNotesMember_019b99e9-eeb9-70db-abcd-644e1f802571" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019b99e9-eeb9-7990-8d7f-c01fb30a8c82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019b99e9-eeb9-79a8-aadc-c1e1e31c1aba" xlink:to="loc_us-gaap_PreferredStockMember_019b99e9-eeb9-7990-8d7f-c01fb30a8c82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019b99e9-eeb9-7954-a021-ff365ea6ad11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_NetIncomeLoss_019b99e9-eeb9-7954-a021-ff365ea6ad11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019b99e9-eeb9-71e2-afe6-2d6faea9baf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019b99e9-eeb9-71e2-afe6-2d6faea9baf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_NetIncomeLossAvailableForDistributionBasic_019b99e9-eeb9-7ec9-b679-0eb177fa4da1" xlink:href="sgh-20260227.xsd#sgh_NetIncomeLossAvailableForDistributionBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_sgh_NetIncomeLossAvailableForDistributionBasic_019b99e9-eeb9-7ec9-b679-0eb177fa4da1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_019b99e9-eeb9-7815-acc8-f3a520ae939a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_019b99e9-eeb9-7815-acc8-f3a520ae939a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019b99e9-eeb9-718a-b74b-7739bd282d27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019b99e9-eeb9-718a-b74b-7739bd282d27" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019b99e9-eeb9-745f-81c9-6543005968bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019b99e9-eeb9-745f-81c9-6543005968bb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019b99e9-eeb9-7efb-ab16-41916c0be590" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019b99e9-eeb9-7efb-ab16-41916c0be590" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_DilutiveEffectOfEquityPlansAndConvertibleNotes_019b99e9-eeb9-7c1b-aa9d-4ef1717e582b" xlink:href="sgh-20260227.xsd#sgh_DilutiveEffectOfEquityPlansAndConvertibleNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_sgh_DilutiveEffectOfEquityPlansAndConvertibleNotes_019b99e9-eeb9-7c1b-aa9d-4ef1717e582b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019b99e9-eeb9-7e4e-bf40-3f3788dc83f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019b99e9-eeb9-7e4e-bf40-3f3788dc83f1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_019b99e9-eeb9-7e6e-8eff-e45c97787413" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_019b99e9-eeb9-7e6e-8eff-e45c97787413" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019b99e9-eeb9-711a-9a52-14ce8eca6cd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_019b99e9-eeb9-7e6e-8eff-e45c97787413" xlink:to="loc_us-gaap_EarningsPerShareBasic_019b99e9-eeb9-711a-9a52-14ce8eca6cd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019b99e9-eeb9-70ec-8360-86d69f2197d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_019b99e9-eeb9-7e6e-8eff-e45c97787413" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019b99e9-eeb9-70ec-8360-86d69f2197d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019b99e9-eeb9-798e-be90-ff7a086f7f0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019b99e9-eeb9-7096-b292-286c0cdbc64b" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019b99e9-eeb9-798e-be90-ff7a086f7f0f" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/SegmentandOtherInformationScheduleofSegmentReportingInformationDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#SegmentandOtherInformationScheduleofSegmentReportingInformationDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/SegmentandOtherInformationScheduleofSegmentReportingInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019b99e9-eeb9-7d16-9101-b3b623548572" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019b99e9-eeb9-7d16-9101-b3b623548572" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019b99e9-eeb9-7abd-9ad0-4bc0d0f7931e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019b99e9-eeb9-7d16-9101-b3b623548572" xlink:to="loc_srt_ConsolidationItemsAxis_019b99e9-eeb9-7abd-9ad0-4bc0d0f7931e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019b99e9-eeb9-7abd-9ad0-4bc0d0f7931e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019b99e9-eeb9-7abd-9ad0-4bc0d0f7931e" xlink:to="loc_srt_ConsolidationItemsDomain_019b99e9-eeb9-7abd-9ad0-4bc0d0f7931e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019b99e9-eeb9-7560-ab37-1d1e6cfce9cb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019b99e9-eeb9-7abd-9ad0-4bc0d0f7931e" xlink:to="loc_srt_ConsolidationItemsDomain_019b99e9-eeb9-7560-ab37-1d1e6cfce9cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019b99e9-eeb9-73a9-ace3-e9de58f310b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019b99e9-eeb9-7560-ab37-1d1e6cfce9cb" xlink:to="loc_us-gaap_OperatingSegmentsMember_019b99e9-eeb9-73a9-ace3-e9de58f310b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019b99e9-eeb9-70b5-85ca-7c54b906feb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019b99e9-eeb9-7560-ab37-1d1e6cfce9cb" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019b99e9-eeb9-70b5-85ca-7c54b906feb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019b99e9-eeb9-7f77-b5df-e47bb6a231ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019b99e9-eeb9-7d16-9101-b3b623548572" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019b99e9-eeb9-7f77-b5df-e47bb6a231ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019b99e9-eeb9-7f77-b5df-e47bb6a231ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019b99e9-eeb9-7f77-b5df-e47bb6a231ac" xlink:to="loc_us-gaap_SegmentDomain_019b99e9-eeb9-7f77-b5df-e47bb6a231ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019b99e9-eeb9-78f3-aad9-9bfd768fcdf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019b99e9-eeb9-7f77-b5df-e47bb6a231ac" xlink:to="loc_us-gaap_SegmentDomain_019b99e9-eeb9-78f3-aad9-9bfd768fcdf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_AdvancedComputingSegmentMember_019b99e9-eeb9-7ea5-9847-a57d887ddb80" xlink:href="sgh-20260227.xsd#sgh_AdvancedComputingSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019b99e9-eeb9-78f3-aad9-9bfd768fcdf4" xlink:to="loc_sgh_AdvancedComputingSegmentMember_019b99e9-eeb9-7ea5-9847-a57d887ddb80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_IntegratedMemorySegmentMember_019b99e9-eeb9-7b0d-8a4f-551fb900b08b" xlink:href="sgh-20260227.xsd#sgh_IntegratedMemorySegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019b99e9-eeb9-78f3-aad9-9bfd768fcdf4" xlink:to="loc_sgh_IntegratedMemorySegmentMember_019b99e9-eeb9-7b0d-8a4f-551fb900b08b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_OptimizedLEDSegmentMember_019b99e9-eeb9-7abc-af98-1dbf0b6c4476" xlink:href="sgh-20260227.xsd#sgh_OptimizedLEDSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019b99e9-eeb9-78f3-aad9-9bfd768fcdf4" xlink:to="loc_sgh_OptimizedLEDSegmentMember_019b99e9-eeb9-7abc-af98-1dbf0b6c4476" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019b99e9-eeb9-7d4a-bcd5-cf98969442a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019b99e9-eeb9-7d4a-bcd5-cf98969442a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019b99e9-eeb9-7003-9628-f1ff949627ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019b99e9-eeb9-7003-9628-f1ff949627ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019b99e9-eeb9-7948-876c-09e0c6a1c045" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_OperatingExpenses_019b99e9-eeb9-7948-876c-09e0c6a1c045" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019b99e9-eeb9-788f-b4ce-85c6c11a65ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_OperatingIncomeLoss_019b99e9-eeb9-788f-b4ce-85c6c11a65ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019b99e9-eeb9-7d64-bc92-8cbd4fa1414f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_ShareBasedCompensation_019b99e9-eeb9-7d64-bc92-8cbd4fa1414f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_AmortizationOfIntangibleAssetsAcquired_019b99e9-eeb9-7a3f-b4f9-c917fe0d3e70" xlink:href="sgh-20260227.xsd#sgh_AmortizationOfIntangibleAssetsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_sgh_AmortizationOfIntangibleAssetsAcquired_019b99e9-eeb9-7a3f-b4f9-c917fe0d3e70" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_CostOfGoodsAndServicesSoldRestructuringCharges_019b99e9-eeb9-7bea-ac6f-0506bcad2fc1" xlink:href="sgh-20260227.xsd#sgh_CostOfGoodsAndServicesSoldRestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_sgh_CostOfGoodsAndServicesSoldRestructuringCharges_019b99e9-eeb9-7bea-ac6f-0506bcad2fc1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_019b99e9-eeb9-7a7e-8d8c-2f6114d276d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationIntegrationRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_019b99e9-eeb9-7a7e-8d8c-2f6114d276d8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_RedomiciliationCosts_019b99e9-eeb9-7602-8b61-9812abb97088" xlink:href="sgh-20260227.xsd#sgh_RedomiciliationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_sgh_RedomiciliationCosts_019b99e9-eeb9-7602-8b61-9812abb97088" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_019cd64d-bfcb-7070-a699-541c9545e552" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_019cd64d-bfcb-7070-a699-541c9545e552" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019b99e9-eeb9-73f7-9d10-cb655a78ec93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_RestructuringCharges_019b99e9-eeb9-73f7-9d10-cb655a78ec93" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherGeneralExpense_019b99e9-eeb9-7f95-8a0c-1573d78d416b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherGeneralExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_OtherGeneralExpense_019b99e9-eeb9-7f95-8a0c-1573d78d416b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_OperatingExpensesUnallocated_019b99e9-eeb9-7de0-b71b-5dbe0e7f212d" xlink:href="sgh-20260227.xsd#sgh_OperatingExpensesUnallocated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_sgh_OperatingExpensesUnallocated_019b99e9-eeb9-7de0-b71b-5dbe0e7f212d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019b99e9-eeb9-76bf-b005-0833f76a5af1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019b99e9-eeb9-76bf-b005-0833f76a5af1" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019b99e9-eeb9-70a1-8a3a-460dfd9cc0d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019b99e9-eeb9-70a1-8a3a-460dfd9cc0d1" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019b99e9-eeb9-7dec-8861-7ece4dc7605f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019b99e9-eeb9-77f5-9409-1c5f08852ebf" xlink:to="loc_us-gaap_Depreciation_019b99e9-eeb9-7dec-8861-7ece4dc7605f" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.smartm.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="sgh-20260227.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.smartm.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019b99e9-eeb9-7e2a-9b62-453cdcb53957" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019b99e9-eeb9-7a03-84d3-f949d06d715a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019b99e9-eeb9-7e2a-9b62-453cdcb53957" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019b99e9-eeb9-7a03-84d3-f949d06d715a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-eeb9-7cd3-b490-0bca8f067c88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019b99e9-eeb9-7a03-84d3-f949d06d715a" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-eeb9-7cd3-b490-0bca8f067c88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019b99e9-eeb9-7cd3-b490-0bca8f067c88_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-eeb9-7cd3-b490-0bca8f067c88" xlink:to="loc_us-gaap_RelatedPartyDomain_019b99e9-eeb9-7cd3-b490-0bca8f067c88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019b99e9-eeb9-7b9b-b466-8d4b8c56aecc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019b99e9-eeb9-7cd3-b490-0bca8f067c88" xlink:to="loc_us-gaap_RelatedPartyDomain_019b99e9-eeb9-7b9b-b466-8d4b8c56aecc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019b99e9-eeb9-730c-bde7-1e2314a1c91a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019b99e9-eeb9-7b9b-b466-8d4b8c56aecc" xlink:to="loc_us-gaap_RelatedPartyMember_019b99e9-eeb9-730c-bde7-1e2314a1c91a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_RelatedPartyVotingInterestPercentage_019cf971-3991-706e-81d0-4ccf513d0733" xlink:href="sgh-20260227.xsd#sgh_RelatedPartyVotingInterestPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019b99e9-eeb9-7e2a-9b62-453cdcb53957" xlink:to="loc_sgh_RelatedPartyVotingInterestPercentage_019cf971-3991-706e-81d0-4ccf513d0733" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sgh_RelatedPartyTransactionContractLiabilityAmount_019b99e9-eeb9-7b3c-bfae-833cba9286b2" xlink:href="sgh-20260227.xsd#sgh_RelatedPartyTransactionContractLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019b99e9-eeb9-7e2a-9b62-453cdcb53957" xlink:to="loc_sgh_RelatedPartyTransactionContractLiabilityAmount_019b99e9-eeb9-7b3c-bfae-833cba9286b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019b99e9-eeb9-7494-bb03-d4969cf94099" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019b99e9-eeb9-7e2a-9b62-453cdcb53957" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019b99e9-eeb9-7494-bb03-d4969cf94099" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019cfe81-5ae8-7264-8790-b4db898355c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019b99e9-eeb9-7e2a-9b62-453cdcb53957" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019cfe81-5ae8-7264-8790-b4db898355c4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_Assets" xlink:type="arc" order="101"/>
  </link:definitionLink>
</link:linkbase>
