EXHIBIT 11.1 QUANTUM CORPORATION COMPUTATION OF NET INCOME PER SHARE (In thousands except per share data)

Three Months Ended Nine Months Ended Dec. 29, Dec. 31, Dec. 29, Dec. 31, 1996 1995 1996 1995 ---------- ---------- ----------- ---------- PRIMARY Weighted average number of common shares during the period 58,218 52,941 57,132 51,131 Incremental common shares attributable to exercise of outstanding options 3,146 - 2,149 3,334 -------- --------- -------- -------- Total shares 61,364 52,941 59,281 54,465 ======== ========= ======== ======== Net income $52,435 $(2,481) $60,851 $32,486 ======== ========= ======== ======== Net income per share $0.85 $(0.05) $1.03 $0.60 ======== ========= ======== ======== FULLY DILUTED Weighted average number of common shares during the period 58,218 52,941 57,132 51,131 Incremental common shares attributable to exercise of outstanding options and conversion of 6 3/8% convertible subordinated debentures and 5% convertible subordinated notes 19,978 9,825 19,236 11,731 -------- --------- -------- -------- Total shares 78,196 62,766 76,368 62,862 ======== ========= ======== ======== Net income: Net income $52,435 $(2,481) $60,851 $32,486 Add 6 3/8% convertible subordinated debentures and 5% convertible subordinated notes interest, net of income tax effect 2,732 1,500 8,414 4,837 Net income, as adjusted $55,167 $(981) $69,265 $37,323 ======== ========= ======== ======== Net income per share $0.71 $(0.02) * $0.91 $0.59 ======== ========= ======== ======== * The primary net income per share is shown in the statements of income as both primary and fully diluted, as the effect of the assumed conversion of the subordinated debt is anti-dilutive.