1 EXHIBIT 11 WESTERN DIGITAL CORPORATION COMPUTATION OF PER SHARE EARNINGS (IN THOUSANDS, EXCEPT PER SHARE DATA) THREE-MONTH PERIOD ENDED NINE-MONTH PERIOD ENDED ------------------------ ------------------------- MARCH 30, APRIL 1, MARCH 30, APRIL 1, 1996 1995 1996 1995 --------- -------- --------- -------- PRIMARY Net income . . . . . . . . . . . . . . . . $19,438 $19,650 $64,158 $96,922 ======= ======= ======= ======= Weighted average number of common shares outstanding during the period . . . 44,895 46,716 47,137 45,765 Incremental common shares attributable to exercise of outstanding options and warrants . . . . . . . . . . . . . . . . . 1,697 1,870 1,753 2,079 ------- ------- ------- ------- Total shares . . . . . . . . . . . . . . . 46,592 48,586 48,890 47,844 ======= ======= ======= ======= Net income per share . . . . . . . . . . . $ .42 $ .40 $ 1.31 $ 2.03 ======= ======= ======= ======= FULLY DILUTED Net income . . . . . . . . . . . . . . . . $19,438 $19,650 $64,158 $96,922 Add back: interest expense, net of income tax effect, applicable to convertible subordinated debentures . . . . -- 813 -- 3,036 ------- ------- ------- ------- $19,438 $20,463 $64,158 $99,958 ======= ======= ======= ======= Weighted average number of common shares outstanding during the period . . . 44,895 46,716 47,137 45,765 Incremental common shares attributable to exercise of outstanding options and warrants . . . . . . . . . . . . . . . . . 1,815 1,870 1,877 2,080 Incremental common shares attributable to conversion of convertible subordinated debentures . . . . . . . . . . . . . . . . -- 2,800 -- 3,519 ------- ------- ------- ------- Total shares . . . . . . . . . . . . . . . 46,710 51,386 49,014 51,364 ======= ======= ======= ======= Net income per share . . . . . . . . . . . $.42 $.40 $1.31 $1.95 ======= ======= ======= =======