X0202 4 2007-09-05 1 0000813347 KOMAG INC /DE/ KOMG 0001135025 KASHNOW RICHARD A 1710 AUTOMATION PARKWAY SAN JOSE CA 95131 1 0 0 0 Common Stock 2007-09-05 4 U 0 16469 32.25 D 6538 D Common Stock 2007-09-05 4 D 0 6538 32.25 D 0 D Director stock option (Right to buy) 10.30 2007-09-05 4 D 0 15000 21.95 D 2014-08-19 Common Stock 15000 0 D Director stock option (Right to buy) 27.54 2007-09-05 4 D 0 12254 4.71 D 2017-05-23 Common Stock 12254 0 D Of these shares, 2,000 were issued pursuant to a 6,000 share restricted stock agreement, which provided for vesting at the rate of 1/3rd of the shares on each of May 11, 2006, May 11, 2007 and May 11, 2008. Of these shares, 4,538 were issued pursuant to a 4,538 share restricted stock agreement, which provided for 100% vesting on May 23, 2008. All 6,538 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 $210,850.50 (or $32.25 per share). The vesting of the restricted stock was accelerated in full in connection with the Merger. This option, originally for 20,000 shares and which provided for vesting at the rate of 1/4th of the shares on 08/19/05 and as to 1/36th of the remaining shares on the 19th of each month thereafter, was canceled in the Merger in exchange for a right to receive cash in the aggregate amount of $329,250, 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. The vesting of the option was accelerated in full in connection with the Merger. This option, which provided for 100% vesting on 05/23/08, was canceled in the Merger in exchange for a right to receive cash in the aggregate amount of $57,716.34, less any applicable withholding taxes, representing the difference between the exercise price of the option and the Offer Price. The vesting of the option was accelerated in full in connection with the Merger. /s/ Jan Schwartz, Attorney-in-fact for Richard A. Kashnow 2007-09-05