1 EXHIBIT 11 WESTERN DIGITAL CORPORATION COMPUTATION OF PER SHARE EARNINGS (IN THOUSANDS, EXCEPT PER SHARE DATA) THREE-MONTH PERIOD ENDED SIX-MONTH PERIOD ENDED --------------------------- ----------------------------- DEC. 28, DEC. 30, DEC. 28, DEC. 30, 1996 1995 1996 1995 ----------- ----------- ------------ ----------- PRIMARY Net income . . . . . . . . . . . . . . . $ 64,229 $ 36,393 $ 97,107 $ 44,720 =========== =========== ============ =========== Weighted average number of common shares outstanding during the period . . 43,975 46,941 43,860 48,257 Incremental common shares attributable to exercise of outstanding options, warrants, put options and ESPP contributions . . . . . . . . . . . . . . 3,405 1,497 2,981 1,782 ----------- ----------- ------------ ----------- Total shares . . . . . . . . . . . . . . 47,380 48,438 46,841 50,039 =========== =========== ============ =========== Net income per share . . . . . . . . . . $ 1.36 $ .75 $ 2.07 $ .89 =========== =========== ============ =========== FULLY DILUTED Net income . . . . . . . . . . . . . . . $ 64,229 $ 36,393 $ 97,107 $ 44,720 =========== =========== ============ =========== Weighted average number of common shares outstanding during the period . . 43,975 46,941 43,860 48,257 Incremental common shares attributable to exercise of outstanding options, warrants, put options and ESPP contributions . . . . . . . . . . . . . 3,568 1,747 3,324 1,909 ----------- ----------- ------------ ----------- Total shares . . . . . . . . . . . . . . 47,543 48,688 47,184 50,166 =========== =========== ============ =========== Net income per share . . . . . . . . . . $ 1.35 $ .75 $ 2.06 $ .89 =========== =========== ============ ===========