<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF QUANTUM CORPORATION FOR THE QUARTER ENDED JULY 2, 2000.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> APR-01-2000
<PERIOD-END> JUL-02-2000
<CASH> 818,301
<SECURITIES> 30,373
<RECEIVABLES> 643,571
<ALLOWANCES> 23,473
<INVENTORY> 259,841
<CURRENT-ASSETS> 231,407
<PP&E> 547,893
<DEPRECIATION> 320,260
<TOTAL-ASSETS> 2,476,387
<CURRENT-LIABILITIES> 855,896
<BONDS> 325,061
0
0
<COMMON> 686,718
<OTHER-SE> 536,411
<TOTAL-LIABILITY-AND-EQUITY> 2,476,387
<SALES> 1,225,053
<TOTAL-REVENUES> 1,225,053
<CGS> 944,578
<TOTAL-COSTS> 944,578
<OTHER-EXPENSES> 195,206
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 6,776
<INCOME-PRETAX> 92,895
<INCOME-TAX> 32,475
<INCOME-CONTINUING> 60,420
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 60,420
<EPS-BASIC> 0<F1>
<EPS-DILUTED> 0<F1>
<FN>
<F1>DSS GROUP EPS - BASIC 0.29
<F1>DSS GROUP EPS - DILUTED 0.28
<F1>HDD GROUP EPS - BASIC 0.20
<F1>HDD GROUP EPS - DILUTED 0.19
</FN>
</TABLE>