X0202 4 2007-09-05 1 0000813347 KOMAG INC /DE/ KOMG 0001376805 CASEY EDWARD JAMES 1710 AUTOMATION PARKWAY SAN JOSE CA 95131 0 1 0 0 SVP, COO Common Stock 2007-09-05 4 U 0 1394 32.25 D 38171 D Common Stock 2007-09-05 4 D 0 38171 32.25 D 0 D Employee Stock option (Right to buy) 6.48 2007-09-05 4 D 0 281 25.77 D 2013-03-17 Common Stock 281 0 D Employee Stock option (Right to buy) 13.16 2007-09-05 4 D 0 156 19.09 D 2013-07-25 Common Stock 156 0 D Employee Stock option (Right to buy) 18.85 2007-09-05 4 D 0 765 13.40 D 2014-03-15 Common Stock 765 0 D Employee Stock option (Right to buy) 20.15 2007-09-05 4 D 0 1166 12.10 D 2015-02-28 Common Stock 1166 0 D Employee Stock option (Right to buy) 32.10 2007-09-05 4 D 0 12614 0.15 D 2017-02-15 Common Stock 12614 0 D Of these shares, 833 were issued pursuant to a 2,500 share restricted stock agreement, which provided for vesting at the rate of 1/3rd of the shares on each of February 15, 2006, February 15, 2007 and February 15, 2008. Of these shares, 2,666 were issued pursuant to a 4,000 share restricted stock agreement, which provided for vesting at the rate of 1/3rd of the shares on each of February 15, 2007, February 15, 2008 and February 15, 2009. Of these shares, 25,000 were issued pursuant to a 25,000 share restricted stock agreement, which provided for vesting at the rate of 1/3rd of the shares on each of October 3, 2007, October 3, 2008 and October 3, 2009. Of these shares, 4,672 were issued pursuant to a 4,672 share restricted stock agreement, which provided for vesting at the rate of 1/3rd of the shares on each of February 15, 2008, February 15, 2009 and February 15, 2010. Continuation of footnote (1). Of these shares, 5,000 were issued pursuant to a 5,000 share restricted stock agreement, which provided for vesting at the rate of 1/3rd of the shares on each of April 13, 2008, April 13, 2009 and April 13, 2010. All 38,171 of such shares were canceled in the merger of State M Corporation, a wholly-owned subsidiary of Western Digital Corporation (the "Parent"), with and into the Issuer (the "Merger"), in exchange for a right to receive cash in the aggregate amount of $1,231,014.75 (or $32.25 per share); provided, however, that the receipt of cash will remain subject to the vesting provisions set forth in the restricted stock agreements and Parent is only obligated to pay cash to the extent the right vests during continued employment. This option, originally for 4,500 shares and which provided for vesting at the rate of 1/4th of the shares on 10/07/03 and as to 1/36th of the remaining shares on the 7th of each month thereafter, was canceled in the Merger in exchange for a right to receive cash in the aggregate amount of $7,241.37, less any applicable withholding taxes, representing the difference between the exercise price of the option and the $32.25 per share offer price (the "Offer Price") in the Merger; provided, however, that the receipt of cash will remain subject to the vesting provisions set forth in the option and Parent is only obligated to pay cash to the extent the right vests during continued employment. This option, originally for 2,500 shares and which provided for vesting at the rate of 1/4th of the shares on 10/07/03 and as to 1/36th of the remaining shares on the 7th of each month thereafter, was canceled in the Merger in exchange for a right to receive cash in the aggregate amount of $2,978.04, less any applicable withholding taxes, representing the difference between the exercise price of the option and the Offer Price; provided, however, that the receipt of cash will remain subject to the vesting provisions set forth in the option and Parent is only obligated to pay cash to the extent the right vests during continued employment. This option, originally for 1,750 shares and which provided for vesting at the rate of 1/4th of the shares on 03/15/05 and as to 1/36th of the remaining shares on the 15th of each month thereafter, was canceled in the Merger in exchange for a right to receive cash in the aggregate amount of $10,251, less any applicable withholding taxes, representing the difference between the exercise price of the option and the Offer Price; provided, however, that the receipt of cash will remain subject to the vesting provisions set forth in the option and Parent is only obligated to pay cash to the extent the right vests during continued employment. This option, originally for 1,750 shares and which provided for vesting at the rate of 1/4th of the shares on 02/28/06 and as to 1/36th of the remaining shares on the 28th of each month thereafter, was canceled in the Merger in exchange for a right to receive cash in the aggregate amount of $14,108.60, less any applicable withholding taxes, representing the difference between the exercise price of the option and the Offer Price; provided, however, that the receipt of cash will remain subject to the vesting provisions set forth in the option and Parent is only obligated to pay cash to the extent the right vests during continued employment. This option, which provided for vesting at the rate of 4,205 shares on 02/15/08 and as to 1/24th of the remaining shares on the 15th of each month thereafter, was canceled in the Merger in exchange for a right to receive cash in the aggregate amount of $1,892.10, less any applicable withholding taxes, representing the difference between the exercise price of the option and the Offer Price; provided, however, that the receipt of cash will remain subject to the vesting provisions set forth in the option and Parent is only obligated to pay cash to the extent the right vests during continued employment. /s/ Jan Schwartz, Attorney-in-fact for Edward Casey 2007-09-05