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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0000709283-05-000010.txt : 20050204
<SEC-HEADER>0000709283-05-000010.hdr.sgml : 20050204
<ACCEPTANCE-DATETIME>20050204151651
ACCESSION NUMBER:		0000709283-05-000010
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050203
FILED AS OF DATE:		20050204
DATE AS OF CHANGE:		20050204

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QUANTUM CORP /DE/
		CENTRAL INDEX KEY:			0000709283
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER STORAGE DEVICES [3572]
		IRS NUMBER:				942665054
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		1650 TECHNOLOGY DR
		STREET 2:		SUITE 800
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95110
		BUSINESS PHONE:		4089444000

	MAIL ADDRESS:	
		STREET 1:		1650 TECHNOLOGY DR
		STREET 2:		SUITE 800
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95110

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GANNON JOHN B
		CENTRAL INDEX KEY:			0001204921

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13449
		FILM NUMBER:		05576901

	BUSINESS ADDRESS:	
		STREET 1:		C/O QUANTUM CORP
		STREET 2:		501 SYCAMORE DR
		CITY:			MILPITAS
		STATE:			CA
		ZIP:			95035
		BUSINESS PHONE:		4089444460

	MAIL ADDRESS:	
		STREET 1:		C/O QUANTUM CORP
		STREET 2:		501 SYCAORE DR
		CITY:			MILPITAS
		STATE:			CA
		ZIP:			95035
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-02-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000709283</issuerCik>
        <issuerName>QUANTUM CORP /DE/</issuerName>
        <issuerTradingSymbol>DSS</issuerTradingSymbol>
    </issuer>

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        <reportingOwnerId>
            <rptOwnerCik>0001204921</rptOwnerCik>
            <rptOwnerName>GANNON JOHN B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O QUANTUM CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>1650 TECHNOLOGY DRIVE, SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>SAN JOSE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President &amp; COO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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    </derivativeTable>

    <footnotes>
        <footnote id="F1">In connection with Mr. Gannon's retirement from Quantum on March 31, 2005, the Board of Directors has extended the expiration date of his vested and exercisable options until May 26, 2006. This extension has resulted in the deemed cancellation of his options and the corresponding grant of new options.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Shawn Hall, by Shawn Hall, Attorney in Fact for John Gannon</signatureName>
        <signatureDate>2005-02-04</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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