POWER OF ATTORNEY
          Know all by these presents, that the undersigned hereby constitutes and appoints
each of, Astrid Becker-Celik, Vivy Dang, Josie Buensuceso and Shawn Hall, signing singly,
the undersigned's true and lawful attorney-in-fact to:
(1) execute for and on behalf of the undersigned, in the undersigned's capacity as
an officer and/or director of Quantum Corporation (the "Company"), Forms 3, 4, and
5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the
rules thereunder;
(2) do and perform any and all acts for and on behalf of the undersigned which may
be necessary or desirable to complete and execute any such Form 3, 4, or 5,
complete and execute any amendment or amendments thereto, and timely file such
form with the United States Securities and Exchange Commission and any stock
exchange or similar authority; and
(3) take any other action in connection with the foregoing which, in the opinion of
such attorney-in-fact, may be of benefit to, in the best interest of, or legally required
by, the undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall
be in such form and shall contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-fact's discretion.
The undersigned hereby grants to each such attorney-in-fact full power and authority to do
and perform any and every act and thing whatsoever requisite, necessary, or proper to be
done in the exercise of any of the rights and powers herein granted, as fully to all intents
and purposes as the undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or
such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by
virtue of this power of attorney and the rights and powers herein granted. The undersigned
acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the
request of the undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of
1934.
This Power of Attorney shall remain in full force and effect until the undersigned is no
longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 30th day of October 2009.

By: /s/ Gerald G. Lopatin
Name: Gerald G. Lopatin

LOPATIN GERALD 4