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Exhibit 32.1
The following certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. 1350 and
in accordance with SEC Release No. 33-8238. This certification shall not be deemed "filed" for purposes of Section 18
of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section, nor shall it be
incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Secu-
rities Exchange Act of 1934, as amended, except to the extent that Western Digital Corporation specifically
incorporates it by reference.
Certification of Chief Executive Officer
Pursuant to 18 U.S.C. 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned
officer of Western Digital Corporation, a Delaware corporation (the "Company"), hereby certifies, to his knowledge,
(i) the accompanying Annual Report on Form 10-K of the Company for the period ended June 28, 2013
(the "Report") fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Secu-
rities Exchange Act of 1934, as amended; and
(ii) the information contained in the Report fairly presents, in all material respects, the financial condition
and results of operations of the Company.
D. M
Stephen D. Milligan
President and Chief Executive Officer
Dated: August 16, 2013