QUANTUM CORPORATION EXHIBIT 12 STATEMENT OF COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES

Years Ended March 31, ------------------------------------------------------------------------------ (In thousands) 1998 1997 1996 1995 1994 ------------------------------------------------------------------------------ Income (loss) before income taxes $ 230,814 $ 200,696 $(141,338) $ 145,305 $ 3,663 Add fixed charges 41,711 56,669 48,226 29,277 18,906 --------- --------- --------- --------- --------- Earnings (as defined) $ 272,525 $ 257,365 $ (93,112) $ 174,582 $ 22,569 ========= ========= ========= ========= ========= Fixed charges Interest expense $ 32,753 $ 47,882 $ 35,904 $ 21,557 $ 14,305 Amortization of debt issuance costs (ii) (ii) 2,427 1,458 577 Estimated interest component of rent expenses 8,958 8,787 9,895 6,262 4,024 --------- --------- --------- --------- --------- Total fixed charges $ 41,711 $ 56,669 $ 48,226 $ 29,277 $ 18,906 ========= ========= ========= ========= ========= Ratio of earnings to fixed charges 6.5 4.5 (i) 6.0 1.2 ========= ========= ========= ========= ========= (i) Earnings (as defined) for fiscal 1996 were insufficient to cover fixed charges by $141.3 million. (ii) In 1997 and 1998 the amortization of debt issuance costs is included in interest expense.

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