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*** Exercise Your Right to Vote ***
Important Notice Regarding the Availability of Proxy Materials for the
Stockholder Meeting to Be Held on September 9, 2014.

Meeting Information
Meeting Type: Annual Meeting
For holders as of: July 14, 2014
Date: September 9, 2014 Time: 8:00 a.m. Pacific Daylight Time
Location:	Quantum's Corporate Headquarters 224 Airport Parkway San Jose, CA 95110

You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting.

See the reverse side of this notice to obtain proxy materials and voting instructions.

Proxy Materials Available to VIEW or RECEIVE:

ANNUAL REPORT AND PROXY STATEMENT

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The Board of Directors Recommends a Vote "For"
Proposals 2, 3, 4 and 5.

2.	Proposal to ratify the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm of the Company for the fiscal year ending March 31, 2015.

3.	Proposal to adopt a resolution approving, on an advisory basis, the compensation of the Company's named executive officers.

4.	Proposal to approve and ratify an amendment to the Company's 2012 Long-Term Incentive Plan.

5.	Proposal to approve and ratify an amendment to the Company's Employee Stock Purchase Plan.


NOTE: Such other business as may properly come before the
meeting or any adjournment thereof.

Filed by the Registrant [X]
Filed by a Party other than the Registrant [ ]

Check the appropriate box:
[ ]	Preliminary Proxy Statement	[ ]	Soliciting Material Under Rule 14a-12
[ ]	Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
[ ]	Definitive Proxy Statement
[X]	Definitive Additional Materials

The Board of Directors Recommends a Vote "For" each
of the nominees named in Proposal 1.

1.	Proposal to elect to the Board of Directors.

	1a.	Paul R. Auvil

	1b.	Philip Black

	1c.	Louis DiNardo

	1d.	Dale L. Fuller

	1e.	Jon W. Gacek

	1f.	David A. Krall

	1g.	Gregg J. Powers

	1h.	David E. Roberson

	1i.	Jeffrey C. Smith

	Quantum Corporation
	(Name of Registrant as Specified In Its Charter)


	(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)