<SEC-DOCUMENT>0001628280-17-007022-index.html : 20170712
<SEC-HEADER>0001628280-17-007022.hdr.sgml : 20170712
<ACCEPTANCE-DATETIME>20170712162548
ACCESSION NUMBER:		0001628280-17-007022
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20170712
DATE AS OF CHANGE:		20170712
EFFECTIVENESS DATE:		20170712

FILER:

	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

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13449
		FILM NUMBER:		17961960

	BUSINESS ADDRESS:	
		STREET 1:		224 AIRPORT PARKWAY
		STREET 2:		SUITE 300
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95110
		BUSINESS PHONE:		408 944 4000

	MAIL ADDRESS:	
		STREET 1:		224 AIRPORT PARKWAY
		STREET 2:		SUITE 300
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95110
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>defa-14a2017.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: defa-14a2017.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>noticeandaccesscard2017001.jpg
<TEXT>
Document 2 - file: noticeandaccesscard2017001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>noticeandaccesscard2017002.jpg
<TEXT>
Document 3 - file: noticeandaccesscard2017002.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>noticeandaccesscard2017003.jpg
<TEXT>
Document 4 - file: noticeandaccesscard2017003.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>noticeandaccesscard2017004.jpg
<TEXT>
Document 5 - file: noticeandaccesscard2017004.jpg

</DOCUMENT>
</SEC-DOCUMENT>