POWER OF ATTORNEY
          Know all by these presents, that the undersigned hereby constitutes and appoints 
each of, Astrid Becker-Celik, Jonathan Cook, 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 14th day of January 2011. 

By: /s/ Linda M. Breard                
      Name: Linda M. Breard