EXHIBIT 11.1 QUANTUM CORPORATION COMPUTATION OF NET INCOME PER SHARE (In thousands except per share data) Three Months Ended July 2, July 3, 1995 1994 PRIMARY Weighted average number of common shares during the period 47,954 44,749 Incremental common shares attributable to exercise of outstanding options 3,758 2,106 Total shares 51,712 46,855 Net income $12,942 $58,241 Net income per share $0.25 $1.24 FULLY DILUTED Weighted average number of common shares during the period 47,954 44,749 Incremental common shares attributable to exercise of outstanding options and conversion of 6 3/8% convertible subordinated debentures 14,285 13,814 Total shares 62,239 58,563 Net income: Net income $12,942 $58,241 Add 6 3/8% convertible subordinated debentures interest, net of income tax effect 1,837 2,093 Net income, as adjusted $14,779 $60,334 Net income per share $0.24 $1.03