Western Digital 2013 NPS Page 70

(1) This amount includes: (i) 10,269,129 shares of our common stock subject to stock options outstanding under

our 2004 Performance Incentive Plan, (ii) 194,409 shares of our common stock subject to stock options
outstanding under our Employee Stock Option Plan, (iii) 3,339,392 shares of our common stock subject to
outstanding RSUs awarded under our 2004 Performance Incentive Plan, and (iv) 214,765 shares of our
common stock subject to deferred stock units credited under our Deferred Compensation Plan.

(2) Includes the maximum number of shares potentially issuable in connection with open performance-based

vesting conditions. As of June 28, 2013, a maximum of 415,686 PSUs (including a target number of
207,843 PSUs) were subject to open performance-based vesting conditions. See "Compensation Discussion
and Analysis" and the "Fiscal 2013 Grants of Plan-Based Awards Table" and the accompanying narrative for
more information regarding outstanding PSUs.

(3) This number reflects the weighted-average exercise price of outstanding options and has been calculated

exclusive of RSUs and PSUs issued under our 2004 Performance Incentive Plan and deferred stock units
credited under our Non-Employee Directors Stock-for-Fees Plan.

(4) Of these shares, as of June 28, 2013, 12,681,279 remained available for future issuance under our 2004

Performance Incentive Plan, zero remained available for future issuance under our Non-Employee Directors
Stock-for-Fees Plan and 7,845,204 remained available for future issuance under our 2005 Employee Stock
Purchase Plan.

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

Under the securities laws of the United States, our directors and officers and persons who beneficially own

more than 10% of our common stock must report their initial ownership of our equity securities and any
subsequent changes in that ownership to the Securities and Exchange Commission and the NASDAQ Stock
Market. The Securities and Exchange Commission has established specific due dates for these reports, and we
must disclose in this Proxy Statement any late filings during fiscal 2013. To our knowledge, based solely on our
review of the copies of such reports required to be furnished to us with respect to fiscal 2013 and the written
responses to annual directors' and officers' questionnaires that no other reports were required, all of these reports
were timely filed during and with respect to fiscal 2013.