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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019f42df-ad03-7579-82fa-e3fb1d8b0b65,g:220f827a-ddf5-4633-be4d-8ee91769b462-->
<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" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="https://xbrl.org/2023/arcrole/summation-item" xlink:type="simple" xlink:href="https://www.xbrl.org/2023/calculation-1.1.xsd#summation-item"/>
  <link:roleRef roleURI="http://quantum.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="qtm-20260630.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://quantum.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-7d16-9ea2-207248504871" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019f42df-ae7d-712e-8ed8-f1755d01a4c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-7d16-9ea2-207248504871" xlink:to="loc_us-gaap_AccountsPayableCurrent_019f42df-ae7d-712e-8ed8-f1755d01a4c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019f42df-ae7d-702f-a25b-47f4b93477ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-7d16-9ea2-207248504871" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019f42df-ae7d-702f-a25b-47f4b93477ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019f42df-ae7d-7bbe-9db1-0888b7f0c595" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-7d16-9ea2-207248504871" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019f42df-ae7d-7bbe-9db1-0888b7f0c595" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019f42df-ae7d-79cb-9e3b-a21a5ff2e0c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-7d16-9ea2-207248504871" xlink:to="loc_us-gaap_LongTermDebtCurrent_019f42df-ae7d-79cb-9e3b-a21a5ff2e0c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-ae7d-77b5-affc-644038e8d598" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-7d16-9ea2-207248504871" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-ae7d-77b5-affc-644038e8d598" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstanding_019f42df-ae7d-7a2e-b1bf-9134defa14fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarrantsAndRightsOutstanding"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-7d16-9ea2-207248504871" xlink:to="loc_us-gaap_WarrantsAndRightsOutstanding_019f42df-ae7d-7a2e-b1bf-9134defa14fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019f42df-ae7d-7b60-a689-e33f16240153" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-78f8-9d03-c89decc4dcbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019f42df-ae7d-7b60-a689-e33f16240153" xlink:to="loc_us-gaap_LiabilitiesCurrent_019f42df-ae7d-78f8-9d03-c89decc4dcbb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_019f42df-ae7d-7439-914d-70bd563dcf11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019f42df-ae7d-7b60-a689-e33f16240153" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_019f42df-ae7d-7439-914d-70bd563dcf11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebt_019f42df-ae7d-7125-881d-71403fec3ba1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019f42df-ae7d-7b60-a689-e33f16240153" xlink:to="loc_us-gaap_ConvertibleDebt_019f42df-ae7d-7125-881d-71403fec3ba1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019f42df-ae7d-7172-990f-38b3a81304a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019f42df-ae7d-7b60-a689-e33f16240153" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019f42df-ae7d-7172-990f-38b3a81304a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019f42df-ae7d-72aa-9be2-cf6d66fe4901" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019f42df-ae7d-7b60-a689-e33f16240153" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019f42df-ae7d-72aa-9be2-cf6d66fe4901" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019f42df-ae7d-7384-ba0e-40395a134bc0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019f42df-ae7d-7343-8abf-e77583ccdd2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019f42df-ae7d-7384-ba0e-40395a134bc0" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019f42df-ae7d-7343-8abf-e77583ccdd2c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019f42df-ae7d-78f6-bacf-9ed126641fbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019f42df-ae7d-7384-ba0e-40395a134bc0" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019f42df-ae7d-78f6-bacf-9ed126641fbc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019f42df-ae7d-7725-b7ef-4e7a69ea5211" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019f42df-ae7d-7384-ba0e-40395a134bc0" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019f42df-ae7d-7725-b7ef-4e7a69ea5211" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019f42df-ae7d-7c51-bdce-c7d66c034640" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019f42df-ae7d-7384-ba0e-40395a134bc0" xlink:to="loc_us-gaap_InventoryNet_019f42df-ae7d-7c51-bdce-c7d66c034640" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_019f42df-ae7d-71fd-8407-5eb8e5adb9a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019f42df-ae7d-7384-ba0e-40395a134bc0" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_019f42df-ae7d-71fd-8407-5eb8e5adb9a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_019f42df-ae7d-792f-a80a-0f914863b634" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019f42df-ae7d-7384-ba0e-40395a134bc0" xlink:to="loc_us-gaap_OtherAssetsCurrent_019f42df-ae7d-792f-a80a-0f914863b634" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019f42df-ae7d-7d70-80f0-d05f95441aea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019f42df-ae7d-751d-9b98-f221eee3fbee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019f42df-ae7d-7d70-80f0-d05f95441aea" xlink:to="loc_us-gaap_AssetsCurrent_019f42df-ae7d-751d-9b98-f221eee3fbee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019f42df-ae7d-7679-a261-6d32fe83c1f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019f42df-ae7d-7d70-80f0-d05f95441aea" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019f42df-ae7d-7679-a261-6d32fe83c1f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019f42df-ae7d-7248-ad5f-1041c292fe85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019f42df-ae7d-7d70-80f0-d05f95441aea" xlink:to="loc_us-gaap_Goodwill_019f42df-ae7d-7248-ad5f-1041c292fe85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019f42df-ae7d-7fb2-bdb7-ab7c348dd029" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019f42df-ae7d-7d70-80f0-d05f95441aea" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019f42df-ae7d-7fb2-bdb7-ab7c348dd029" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019f42df-ae7d-7971-8f1d-71968a3080c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019f42df-ae7d-7d70-80f0-d05f95441aea" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019f42df-ae7d-7971-8f1d-71968a3080c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019f42df-ae7d-7d21-8747-933ea010aa9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019f42df-ae7d-701d-971c-5ee8e8502ae6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019f42df-ae7d-7d21-8747-933ea010aa9d" xlink:to="loc_us-gaap_PreferredStockValue_019f42df-ae7d-701d-971c-5ee8e8502ae6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019f42df-ae7d-7c47-8aed-0848a6066762" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019f42df-ae7d-7d21-8747-933ea010aa9d" xlink:to="loc_us-gaap_CommonStockValue_019f42df-ae7d-7c47-8aed-0848a6066762" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019f42df-ae7d-77c8-8526-b5f08043dc92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019f42df-ae7d-7d21-8747-933ea010aa9d" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019f42df-ae7d-77c8-8526-b5f08043dc92" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019f42df-ae7d-7cd3-8404-90d70c8ee19d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019f42df-ae7d-7d21-8747-933ea010aa9d" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019f42df-ae7d-7cd3-8404-90d70c8ee19d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019f42df-ae7d-7d98-9cab-b701b51f4382" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019f42df-ae7d-7d21-8747-933ea010aa9d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019f42df-ae7d-7d98-9cab-b701b51f4382" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019f42df-ae7d-7f39-949d-ea93216a15ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019f42df-ae7d-7812-a916-d02aff3cb1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019f42df-ae7d-7f39-949d-ea93216a15ef" xlink:to="loc_us-gaap_Liabilities_019f42df-ae7d-7812-a916-d02aff3cb1a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019f42df-ae7d-707c-a673-20f0de29f060" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019f42df-ae7d-7f39-949d-ea93216a15ef" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019f42df-ae7d-707c-a673-20f0de29f060" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019f42df-ae7d-73dc-8aa8-c78dc8ce7456" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019f42df-ae7d-7f39-949d-ea93216a15ef" xlink:to="loc_us-gaap_StockholdersEquity_019f42df-ae7d-73dc-8aa8-c78dc8ce7456" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" xlink:type="simple" xlink:href="qtm-20260630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS"/>
  <link:calculationLink xlink:role="http://quantum.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-7c05-ab1a-ebab92ec81b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019f42df-ae7d-7ee8-93cf-ee34b403757f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-7c05-ab1a-ebab92ec81b6" xlink:to="loc_us-gaap_OperatingIncomeLoss_019f42df-ae7d-7ee8-93cf-ee34b403757f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019f42df-ae7d-723f-bf11-58aefae7266d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-7c05-ab1a-ebab92ec81b6" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019f42df-ae7d-723f-bf11-58aefae7266d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019f42df-ae7d-75f1-a367-88c7950e1ef4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-7c05-ab1a-ebab92ec81b6" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019f42df-ae7d-75f1-a367-88c7950e1ef4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_019f42df-ae7d-7169-a555-d3abcf50f7e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAdjustmentOfWarrants"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-7c05-ab1a-ebab92ec81b6" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_019f42df-ae7d-7169-a555-d3abcf50f7e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_FairValueAdjustmentOfConvertibleNote_019f42df-ae7d-7e60-a48e-4f1e9dd9637b" xlink:href="qtm-20260630.xsd#qtm_FairValueAdjustmentOfConvertibleNote"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-7c05-ab1a-ebab92ec81b6" xlink:to="loc_qtm_FairValueAdjustmentOfConvertibleNote_019f42df-ae7d-7e60-a48e-4f1e9dd9637b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019f42df-ae7d-7b45-8cd4-58d75badbdae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-7c05-ab1a-ebab92ec81b6" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019f42df-ae7d-7b45-8cd4-58d75badbdae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019f42df-ae7d-7d08-96a6-25ddbf7a4bb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-70eb-91ea-2ff78e587b2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019f42df-ae7d-7d08-96a6-25ddbf7a4bb4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019f42df-ae7d-70eb-91ea-2ff78e587b2b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019f42df-ae7d-7cca-a9f3-3ced1a66c178" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019f42df-ae7d-7d08-96a6-25ddbf7a4bb4" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019f42df-ae7d-7cca-a9f3-3ced1a66c178" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019f42df-ae7d-75d1-ae82-f33f63b0e575" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019f42df-ae7d-76b2-824e-5fc806a8def4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_019f42df-ae7d-75d1-ae82-f33f63b0e575" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019f42df-ae7d-76b2-824e-5fc806a8def4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019f42df-ae7d-7b13-b5cc-de0b14476afa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_019f42df-ae7d-75d1-ae82-f33f63b0e575" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019f42df-ae7d-7b13-b5cc-de0b14476afa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_019f42df-ae7d-7baf-a70c-5c992bfcbde9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019f42df-ae7d-74e9-809c-a8eb688255aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019f42df-ae7d-7baf-a70c-5c992bfcbde9" xlink:to="loc_us-gaap_NetIncomeLoss_019f42df-ae7d-74e9-809c-a8eb688255aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_019f42df-ae7d-72fe-927c-9e5132cea75e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019f42df-ae7d-7baf-a70c-5c992bfcbde9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_019f42df-ae7d-72fe-927c-9e5132cea75e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionBeforeTaxAfterReclassificationAdjustmentAttributableToParent_019fd0c7-8500-7f7f-9a17-9e10b70c0f11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionBeforeTaxAfterReclassificationAdjustmentAttributableToParent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019f42df-ae7d-7baf-a70c-5c992bfcbde9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionBeforeTaxAfterReclassificationAdjustmentAttributableToParent_019fd0c7-8500-7f7f-9a17-9e10b70c0f11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019f42df-ae7d-73c8-8453-25ff7a063d68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_019f42df-ae7d-7353-b6cd-af4676b7b64a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019f42df-ae7d-73c8-8453-25ff7a063d68" xlink:to="loc_us-gaap_SellingAndMarketingExpense_019f42df-ae7d-7353-b6cd-af4676b7b64a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019f42df-ae7d-7abd-b491-a1786c11ba17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019f42df-ae7d-73c8-8453-25ff7a063d68" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019f42df-ae7d-7abd-b491-a1786c11ba17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019f42df-ae7d-79db-a3b1-2c18f8b44668" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019f42df-ae7d-73c8-8453-25ff7a063d68" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019f42df-ae7d-79db-a3b1-2c18f8b44668" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019f42df-ae7d-7912-a6c1-e12795d13dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019f42df-ae7d-73c8-8453-25ff7a063d68" xlink:to="loc_us-gaap_RestructuringCharges_019f42df-ae7d-7912-a6c1-e12795d13dd6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019f42df-ae7d-783d-a300-0077050be475" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019f42df-ae7d-79d7-b3b9-134fe9d3c218" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_019f42df-ae7d-783d-a300-0077050be475" xlink:to="loc_us-gaap_GrossProfit_019f42df-ae7d-79d7-b3b9-134fe9d3c218" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019f42df-ae7d-778b-a116-a981c252f5c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_019f42df-ae7d-783d-a300-0077050be475" xlink:to="loc_us-gaap_OperatingExpenses_019f42df-ae7d-778b-a116-a981c252f5c3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="qtm-20260630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://quantum.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7b58-987b-354f88d99b45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt_019f42df-ae7d-7cf6-b831-0c0a04808ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7b58-987b-354f88d99b45" xlink:to="loc_us-gaap_RepaymentsOfSecuredDebt_019f42df-ae7d-7cf6-b831-0c0a04808ea2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfAssumedDebt_019f42df-ae7d-7398-a4a6-fd6f2f3b4329" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfAssumedDebt"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7b58-987b-354f88d99b45" xlink:to="loc_us-gaap_RepaymentsOfAssumedDebt_019f42df-ae7d-7398-a4a6-fd6f2f3b4329" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_019f42df-ae7d-7a43-bc4d-f9c8afee4428" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7b58-987b-354f88d99b45" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_019f42df-ae7d-7a43-bc4d-f9c8afee4428" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_019f42df-ae7d-7a54-b64c-d09678a33f0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7b58-987b-354f88d99b45" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_019f42df-ae7d-7a54-b64c-d09678a33f0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_ProceedsFromSharesIssuedRelatedToSEPANet_019f42df-ae7d-7a0c-ae9d-76279229067d" xlink:href="qtm-20260630.xsd#qtm_ProceedsFromSharesIssuedRelatedToSEPANet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7b58-987b-354f88d99b45" xlink:to="loc_qtm_ProceedsFromSharesIssuedRelatedToSEPANet_019f42df-ae7d-7a0c-ae9d-76279229067d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019f42df-ae7d-7ada-8c99-74b73f149d13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7b58-987b-354f88d99b45" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019f42df-ae7d-7ada-8c99-74b73f149d13" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019f42df-ae7d-7b92-af69-3c9ce47fc10d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7741-a2ca-b1ee751e8841" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019f42df-ae7d-7b92-af69-3c9ce47fc10d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7741-a2ca-b1ee751e8841" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019f42df-ae7d-7352-a1c0-52aa023c8183" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019f42df-ae7d-7b92-af69-3c9ce47fc10d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019f42df-ae7d-7352-a1c0-52aa023c8183" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7106-9925-93040806db7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019f42df-ae7d-7b92-af69-3c9ce47fc10d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019f42df-ae7d-7106-9925-93040806db7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019f42df-ae7d-70c0-a730-780bfc959d58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019f42df-ae7d-7b92-af69-3c9ce47fc10d" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019f42df-ae7d-70c0-a730-780bfc959d58" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019f42df-ae7d-720f-a9ee-47263d106b66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_NetIncomeLoss_019f42df-ae7d-720f-a9ee-47263d106b66" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019f42df-ae7d-7f27-b560-d8a2f49f69f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019f42df-ae7d-7f27-b560-d8a2f49f69f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_019f42df-ae7d-7d47-8854-5f6da8f7ff3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_019f42df-ae7d-7d47-8854-5f6da8f7ff3f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019f42df-ae7d-733c-9ea4-f4c46dc145f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019f42df-ae7d-733c-9ea4-f4c46dc145f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaidInKindInterest_019f42df-ae7d-7402-9d3a-1100decb657d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaidInKindInterest"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_PaidInKindInterest_019f42df-ae7d-7402-9d3a-1100decb657d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_ProvisionForProductAndManufacturingInventories_019f42df-ae7d-7680-8d85-7cc30753fa66" xlink:href="qtm-20260630.xsd#qtm_ProvisionForProductAndManufacturingInventories"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_qtm_ProvisionForProductAndManufacturingInventories_019f42df-ae7d-7680-8d85-7cc30753fa66" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019f42df-ae7d-7fb9-8964-abb9868aaa5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_ShareBasedCompensation_019f42df-ae7d-7fb9-8964-abb9868aaa5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_WarrantsIssuedInConnectionWithDebtAmendments_019f42df-ae7d-7898-88d7-4bb16788f2de" xlink:href="qtm-20260630.xsd#qtm_WarrantsIssuedInConnectionWithDebtAmendments"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_qtm_WarrantsIssuedInConnectionWithDebtAmendments_019f42df-ae7d-7898-88d7-4bb16788f2de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_019f42df-ae7d-7460-b3fb-15f16bde3416" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAdjustmentOfWarrants"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_019f42df-ae7d-7460-b3fb-15f16bde3416" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_FairValueAdjustmentOfConvertibleNote_019f42df-ae7d-7392-b48a-7a7da1a07e75" xlink:href="qtm-20260630.xsd#qtm_FairValueAdjustmentOfConvertibleNote"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_qtm_FairValueAdjustmentOfConvertibleNote_019f42df-ae7d-7392-b48a-7a7da1a07e75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_NoncashGainLossOnExtinguishmentOfDebt_019f42df-ae7d-737d-8d5d-3b4205e3a5e4" xlink:href="qtm-20260630.xsd#qtm_NoncashGainLossOnExtinguishmentOfDebt"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_qtm_NoncashGainLossOnExtinguishmentOfDebt_019f42df-ae7d-737d-8d5d-3b4205e3a5e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_019f42df-ae7d-7a74-94a9-dabae2a7bf01" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_019f42df-ae7d-7a74-94a9-dabae2a7bf01" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019f42df-ae7d-74bf-9f0e-a9136998c3ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019f42df-ae7d-74bf-9f0e-a9136998c3ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_019f42df-ae7d-7ec0-bcb9-4ef05ff5dc4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_019f42df-ae7d-7ec0-bcb9-4ef05ff5dc4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019f42df-ae7d-7c73-a7ef-eb0046ccf1df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019f42df-ae7d-7c73-a7ef-eb0046ccf1df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_019f42df-ae7d-7c04-b9b3-8badd7895d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidExpense"/>
    <link:calculationArc order="16" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_019f42df-ae7d-7c04-b9b3-8badd7895d7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_019f42df-ae7d-7017-aafb-eba974ee44af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:calculationArc order="17" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_019f42df-ae7d-7017-aafb-eba974ee44af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_019f42df-ae7d-72a4-8e9f-bd2d64db70ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:calculationArc order="18" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_019f42df-ae7d-72a4-8e9f-bd2d64db70ad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_019f42df-ae7d-72c5-8c2c-f4c3fd3dcd9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInRestructuringReserve"/>
    <link:calculationArc order="19" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_019f42df-ae7d-72c5-8c2c-f4c3fd3dcd9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_019f42df-ae7d-74f2-b41b-0c2cbc731953" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"/>
    <link:calculationArc order="20" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_019f42df-ae7d-74f2-b41b-0c2cbc731953" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019f42df-ae7d-7414-8362-210f735179bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="21" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019f42df-ae7d-7414-8362-210f735179bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019f42df-ae7d-72c4-8fe0-a84d5435993d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:calculationArc order="22" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019f42df-ae7d-7056-b2d8-28537886ee8f" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019f42df-ae7d-72c4-8fe0-a84d5435993d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019f42df-ae7d-7759-b7f1-bda3aeab52a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019f42df-ae7d-7298-b0ae-1903d8fcdd52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019f42df-ae7d-7759-b7f1-bda3aeab52a7" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019f42df-ae7d-7298-b0ae-1903d8fcdd52" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSCashReconciliationParentheticals" xlink:type="simple" xlink:href="qtm-20260630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSCashReconciliationParentheticals"/>
  <link:calculationLink xlink:role="http://quantum.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSCashReconciliationParentheticals" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019f42df-ae7d-7dad-87c2-2d3a4a6177fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019f42df-ae7d-7d1e-b5c0-9e347a284540" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019f42df-ae7d-7dad-87c2-2d3a4a6177fc" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019f42df-ae7d-7d1e-b5c0-9e347a284540" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019f42df-ae7d-7b18-8fe0-71f4af3a0c03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019f42df-ae7d-7dad-87c2-2d3a4a6177fc" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019f42df-ae7d-7b18-8fe0-71f4af3a0c03" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/REVENUEScheduleofRemainingPerformanceObligationsDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#REVENUEScheduleofRemainingPerformanceObligationsDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/REVENUEScheduleofRemainingPerformanceObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019f42df-ae7d-7fdc-a45a-6d5c6714dd10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_RevenueRemainingPerformanceObligationCurrent_019f42df-ae7d-7d71-ba08-2c313cbfc9b7" xlink:href="qtm-20260630.xsd#qtm_RevenueRemainingPerformanceObligationCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligation_019f42df-ae7d-7fdc-a45a-6d5c6714dd10" xlink:to="loc_qtm_RevenueRemainingPerformanceObligationCurrent_019f42df-ae7d-7d71-ba08-2c313cbfc9b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_RevenueRemainingPerformanceObligationNoncurrent_019f42df-ae7d-7602-81f8-8fa2e5d5bad6" xlink:href="qtm-20260630.xsd#qtm_RevenueRemainingPerformanceObligationNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligation_019f42df-ae7d-7fdc-a45a-6d5c6714dd10" xlink:to="loc_qtm_RevenueRemainingPerformanceObligationNoncurrent_019f42df-ae7d-7602-81f8-8fa2e5d5bad6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/REVENUEScheduleofDeferredRevenuebyArrangementDisclosureDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#REVENUEScheduleofDeferredRevenuebyArrangementDisclosureDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/REVENUEScheduleofDeferredRevenuebyArrangementDisclosureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_019f42df-ae7d-7401-ad2c-af6be80c392a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019f42df-ae7d-7c4f-9f03-64e707a96baa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ContractWithCustomerLiability_019f42df-ae7d-7401-ad2c-af6be80c392a" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019f42df-ae7d-7c4f-9f03-64e707a96baa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_019f42df-ae7d-7cca-9a0c-8d7049c49fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ContractWithCustomerLiability_019f42df-ae7d-7401-ad2c-af6be80c392a" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_019f42df-ae7d-7cca-9a0c-8d7049c49fb9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/BALANCESHEETINFORMATIONScheduleofManufacturingInventoriesDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#BALANCESHEETINFORMATIONScheduleofManufacturingInventoriesDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/BALANCESHEETINFORMATIONScheduleofManufacturingInventoriesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019f42df-af3f-74cb-8854-abb3dfeabb72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_019f42df-af3f-70cb-8f9e-ba69e280612f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_019f42df-af3f-74cb-8854-abb3dfeabb72" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_019f42df-af3f-70cb-8f9e-ba69e280612f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_019f42df-af3f-7058-90e6-74bba9ce65be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryWorkInProcessNetOfReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_019f42df-af3f-74cb-8854-abb3dfeabb72" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_019f42df-af3f-7058-90e6-74bba9ce65be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_019f42df-af3f-750c-9679-ceda843757e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryRawMaterialsNetOfReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_019f42df-af3f-74cb-8854-abb3dfeabb72" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_019f42df-af3f-750c-9679-ceda843757e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryPartsAndComponentsNetOfReserves_019f42df-af3f-7e6b-a026-170f638ee17d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryPartsAndComponentsNetOfReserves"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_019f42df-af3f-74cb-8854-abb3dfeabb72" xlink:to="loc_us-gaap_InventoryPartsAndComponentsNetOfReserves_019f42df-af3f-7e6b-a026-170f638ee17d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/BALANCESHEETINFORMATIONScheduleofOtherLongTermAssetsDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#BALANCESHEETINFORMATIONScheduleofOtherLongTermAssetsDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/BALANCESHEETINFORMATIONScheduleofOtherLongTermAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019f42df-af3f-7ee9-a7b8-0e1d23ac71c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019f42df-af3f-7143-81e0-d63686b4aaa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_019f42df-af3f-7ee9-a7b8-0e1d23ac71c7" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019f42df-af3f-7143-81e0-d63686b4aaa8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019f42df-af3f-7d64-8717-89959969cfde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerAssetNetNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_019f42df-af3f-7ee9-a7b8-0e1d23ac71c7" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019f42df-af3f-7d64-8717-89959969cfde" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_019f42df-af3f-73ca-bdad-19d52435c8c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_019f42df-af3f-7ee9-a7b8-0e1d23ac71c7" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_019f42df-af3f-73ca-bdad-19d52435c8c5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsStateTaxes_019f42df-af3f-70bb-a20f-c6aedc33e939" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredTaxAssetsStateTaxes"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_019f42df-af3f-7ee9-a7b8-0e1d23ac71c7" xlink:to="loc_us-gaap_DeferredTaxAssetsStateTaxes_019f42df-af3f-70bb-a20f-c6aedc33e939" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/BALANCESHEETINFORMATIONScheduleofOtherAccruedLiabilitiesDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#BALANCESHEETINFORMATIONScheduleofOtherAccruedLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/BALANCESHEETINFORMATIONScheduleofOtherAccruedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_AccruedExpenses_019f42df-af3f-7935-9de2-14613ea8471c" xlink:href="qtm-20260630.xsd#qtm_AccruedExpenses"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:to="loc_qtm_AccruedExpenses_019f42df-af3f-7935-9de2-14613ea8471c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrent_019f42df-af3f-7548-b8a3-bbd1c9497cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPayableCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:to="loc_us-gaap_InterestPayableCurrent_019f42df-af3f-7548-b8a3-bbd1c9497cb7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_AccruedSupplierOwnedInventoryObsolescence_019f42df-af3f-7cca-95e4-7101ac46c134" xlink:href="qtm-20260630.xsd#qtm_AccruedSupplierOwnedInventoryObsolescence"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:to="loc_qtm_AccruedSupplierOwnedInventoryObsolescence_019f42df-af3f-7cca-95e4-7101ac46c134" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_019f42df-af3f-7deb-ba8c-79613701c2b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedIncomeTaxesCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_019f42df-af3f-7deb-ba8c-79613701c2b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_AccruedWarranty_019f42df-af3f-712c-bdf0-b6a833425845" xlink:href="qtm-20260630.xsd#qtm_AccruedWarranty"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:to="loc_qtm_AccruedWarranty_019f42df-af3f-712c-bdf0-b6a833425845" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_019f42df-af3f-79d7-8404-975b8796f95f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_019f42df-af3f-79d7-8404-975b8796f95f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_019f42df-af3f-7fea-80bf-553ddbc6b149" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:to="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_019f42df-af3f-7fea-80bf-553ddbc6b149" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_019f42df-af3f-751a-a4bd-999b20fd666f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_019f42df-af3f-7357-95b2-ede387216013" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_019f42df-af3f-751a-a4bd-999b20fd666f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/DEBTScheduleofDebtDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#DEBTScheduleofDebtDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/DEBTScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019f42df-af40-70ca-8bbb-0e1caa1e2333" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019f42df-af40-719e-a662-96e954177944" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_019f42df-af40-70ca-8bbb-0e1caa1e2333" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019f42df-af40-719e-a662-96e954177944" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019f42df-af40-7fd0-96ee-f6be3b89833c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_019f42df-af40-70ca-8bbb-0e1caa1e2333" xlink:to="loc_us-gaap_LongTermDebtCurrent_019f42df-af40-7fd0-96ee-f6be3b89833c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_SecuredDebtGross_019f42df-af40-7eaf-88fa-f548c1fbb24d" xlink:href="qtm-20260630.xsd#qtm_SecuredDebtGross"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_019f42df-af40-70ca-8bbb-0e1caa1e2333" xlink:to="loc_qtm_SecuredDebtGross_019f42df-af40-7eaf-88fa-f548c1fbb24d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtNoncurrent_019f42df-af40-762b-9d62-1d5ab6dc19ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_019f42df-af40-70ca-8bbb-0e1caa1e2333" xlink:to="loc_us-gaap_ConvertibleDebtNoncurrent_019f42df-af40-762b-9d62-1d5ab6dc19ef" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/LEASESSupplementalBalanceSheetDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#LEASESSupplementalBalanceSheetDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/LEASESSupplementalBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019f42df-af40-761f-b90c-94f106028774" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_019f42df-af40-764f-ac8c-90f4054fa256" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_019f42df-af40-761f-b90c-94f106028774" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_019f42df-af40-764f-ac8c-90f4054fa256" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019f42df-af40-7e67-8ab3-77a662dfa603" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_019f42df-af40-761f-b90c-94f106028774" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019f42df-af40-7e67-8ab3-77a662dfa603" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/LEASESLeaseCostDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#LEASESLeaseCostDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/LEASESLeaseCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_019f42df-af40-7c07-afe5-120f24c7a5cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_019f42df-af40-717e-a222-65b3750f5f57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_019f42df-af40-7c07-afe5-120f24c7a5cc" xlink:to="loc_us-gaap_OperatingLeaseCost_019f42df-af40-717e-a222-65b3750f5f57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_019f42df-af40-73a1-94ad-12634def5296" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_019f42df-af40-7c07-afe5-120f24c7a5cc" xlink:to="loc_us-gaap_VariableLeaseCost_019f42df-af40-73a1-94ad-12634def5296" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_019f42df-af40-7c73-b021-5740aa7c65fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_019f42df-af40-7c07-afe5-120f24c7a5cc" xlink:to="loc_us-gaap_ShortTermLeaseCost_019f42df-af40-7c73-b021-5740aa7c65fa" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/LEASESScheduleofLesseeOperatingLeaseLiabilityMaturityDetails" xlink:type="simple" xlink:href="qtm-20260630.xsd#LEASESScheduleofLesseeOperatingLeaseLiabilityMaturityDetails"/>
  <link:calculationLink xlink:role="http://quantum.com/role/LEASESScheduleofLesseeOperatingLeaseLiabilityMaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019f42df-af40-7fc6-80ce-6319c9c857ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_019f42df-af40-7195-aaea-fe6e0516e3af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019f42df-af40-7fc6-80ce-6319c9c857ec" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_019f42df-af40-7195-aaea-fe6e0516e3af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019f42df-af40-7bd5-88bb-68c06f29eaee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019f42df-af40-7fc6-80ce-6319c9c857ec" xlink:to="loc_us-gaap_OperatingLeaseLiability_019f42df-af40-7bd5-88bb-68c06f29eaee" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://quantum.com/role/LEASESScheduleofLesseeOperatingLeaseLiabilityMaturityDetails_1" xlink:type="simple" xlink:href="qtm-20260630.xsd#LEASESScheduleofLesseeOperatingLeaseLiabilityMaturityDetails_1"/>
  <link:calculationLink xlink:role="http://quantum.com/role/LEASESScheduleofLesseeOperatingLeaseLiabilityMaturityDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd0bf-0bd1-712b-8298-f750fa94af0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_019fd0bf-0bd1-786c-aec8-3847dca84fd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd0bf-0bd1-712b-8298-f750fa94af0e" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_019fd0bf-0bd1-786c-aec8-3847dca84fd3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_019fd0bf-0bd1-7ebf-ae39-99458908a553" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd0bf-0bd1-712b-8298-f750fa94af0e" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_019fd0bf-0bd1-7ebf-ae39-99458908a553" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_019fd0bf-0bd1-7e5d-b4fb-fb3b74ebaf18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd0bf-0bd1-712b-8298-f750fa94af0e" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_019fd0bf-0bd1-7e5d-b4fb-fb3b74ebaf18" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_019fd0bf-0bd1-7a61-8542-f22d81a9e3d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd0bf-0bd1-712b-8298-f750fa94af0e" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_019fd0bf-0bd1-7a61-8542-f22d81a9e3d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_019fd0bf-0bd1-7245-a41a-23b089db8e16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd0bf-0bd1-712b-8298-f750fa94af0e" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_019fd0bf-0bd1-7245-a41a-23b089db8e16" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qtm_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_019fd0bf-0bd1-7a84-81ff-5d54402b08b3" xlink:href="qtm-20260630.xsd#qtm_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd0bf-0bd1-712b-8298-f750fa94af0e" xlink:to="loc_qtm_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_019fd0bf-0bd1-7a84-81ff-5d54402b08b3" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
