X0202 4 2007-09-05 1 0000813347 KOMAG INC /DE/ KOMG 0001230569 BAYLESS KATHLEEN A 1710 AUTOMATION PARKWAY SAN JOSE CA 95131 0 1 0 0 EVP, CFO Common Stock 2007-09-05 4 U 0 8356 32.25 D 22894 D Common Stock 2007-09-05 4 D 0 22894 32.25 D 0 D Employee Stock option (Right to buy) 18.85 2007-09-05 4 D 0 3557 13.40 D 2014-03-15 Common Stock 3557 0 D Employee Stock option (Right to buy) 32.10 2007-09-05 4 D 0 10513 0.15 D 2017-02-15 Common Stock 10513 0 D Of these shares, 4,000 were issued pursuant to a 12,000 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, 10,000 were issued pursuant to a 15,000 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, 3,894 were issued pursuant to a 3,894 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. 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. Continuation of footnote (1). All 22,894 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 $738,331.50 (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 6,250 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 $47,663.80, 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, which provided for vesting at the rate of 3,505 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 $1,576.95, 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 Kathleen A. Bayless 2007-09-05