<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF QUANTUM CORPORATION.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> APR-01-2000
<PERIOD-END> OCT-01-2000
<CASH> 795,504
<SECURITIES> 16,814
<RECEIVABLES> 641,676
<ALLOWANCES> 22,638
<INVENTORY> 243,754
<CURRENT-ASSETS> 253,307
<PP&E> 554,567
<DEPRECIATION> 322,158
<TOTAL-ASSETS> 2,457,528
<CURRENT-LIABILITIES> 882,731
<BONDS> 324,737
0
0
<COMMON> 723,697
<OTHER-SE> 454,846
<TOTAL-LIABILITY-AND-EQUITY> 2,457,528
<SALES> 2,406,064
<TOTAL-REVENUES> 2,406,064
<CGS> 1,884,711
<TOTAL-COSTS> 1,884,711
<OTHER-EXPENSES> 383,543
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 13,688
<INCOME-PRETAX> 149,336
<INCOME-TAX> 53,302
<INCOME-CONTINUING> 96,034
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 96,034
<EPS-BASIC> 0<F1>
<EPS-DILUTED> 0<F2>
<FN>
<F1>DSS Group EPS - Basic 0.60
HDD Group EPS - Basic 0.10
<F2>DSS Group EPS - Diluted 0.57
HDD Group EPS - Diluted 0.09
</FN>
</TABLE>