LIMITED POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and
appoints each of Raymond M. Bukaty, Michael Ray, Shelly Heyduk, Sandra Garcia
and Van Huynh, 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 Western Digital 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 of any type whatsoever 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
limited 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 Limited 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 Limited Power of Attorney
to be executed as of this 2nd day of May, 2007.



		/s/ Matthew E. Massengill
			Signature

		Matthew E. Massengill
			Print Name