POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby
constitutes and appoints each of Rita Larsen, Charles Constanti,
Elizabeth Gaubeka, Jennifer Carter 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 14th day of June, 2004.


By: /s/ Edward J. Hayes, Jr.
Name:  Edward J. Hayes, Jr.