X0203 3 2010-08-16 0 0000106040 WESTERN DIGITAL CORP WDC 0001499694 MORRIS JAMES D C/O WESTERN DIGITAL CORPORATION 20511 LAKE FOREST DRIVE LAKE FOREST CA 92630-7741 0 1 0 0 EVP & GM, Client Sys Storage Common Stock 38937 D Employee Stock Option (right to buy) 16.85 2010-02-04 2016-02-04 Common Stock 46863 D Employee Stock Option (right to buy) 19.4 2007-11-08 2016-11-08 Common Stock 7841 D Employee Stock Option (right to buy) 23.46 2008-09-12 2014-09-12 Common Stock 7194 D Employee Stock Option (right to buy) 23.78 2009-09-11 2015-09-11 Common Stock 19943 D Employee Stock Option (right to buy) 28.09 2009-02-06 2015-02-06 Common Stock 7438 D Employee Stock Option (right to buy) 35.75 2010-09-10 2016-09-10 Common Stock 14918 D The option vested 25% one year from the grant date of February 4, 2009, and an additional 6.25% vested at the end of each three-month period through August 4, 2010. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on February 4, 2013. The option vested 25% one year from the grant date of November 8, 2006, and an additional 6.25% vested at the end of each three-month period through August 8, 2010. The remaining shares subject to the option will vest in full on November 8, 2010. The option vested 25% one year from the grant date of September 12, 2007, and an additional 6.25% vested at the end of each three-month period through June 12, 2010. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on September 12, 2011. The option vested 25% one year from the grant date of September 11, 2008, and an additional 6.25% vested at the end of each three-month period through June 11, 2010. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on September 11, 2012. The option vested 25% one year from the grant date of February 6, 2008, and an additional 6.25% vested at the end of each three-month period through August 6, 2010. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on February 6, 2012. The option vests 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter. By: /s/ Sandra Garcia Attorney-in-Fact For: James D. Morris 2010-08-23