X0201 4 2004-03-15 0 0000813347 KOMAG INC /DE/ KOMG 0001250786 VAN WICKLE HARRY GEORGE 21261 GLENMONT DRIVE SARATOGA CA 95070 1 0 0 0 Non-Qualified Stock Option (right to buy) 18.8500 2004-03-15 4 A 0 5000.0000 0 A 2005-03-15 2014-03-15 Common Stock 5000.0000 5000.0000 D One-fourth (1/4) of the shares subject to the Option shall vest on 03/15/2005 and 1/36 of the remaining shares subject to the Option shall vest on the 15th of each month thereafter, subject to the Optionee continuing to be a Participant of Komag Incorporated Amended and Restated 2002 Qualified Stock Plan on such dates. /s/ Jan Schwartz, Attorney-in-fact for Harry G. Van Wickle 2004-03-16