<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>                     <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-2000             MAR-31-2000             MAR-31-2000
<PERIOD-START>                             APR-01-1999             APR-01-1999             APR-01-1999
<PERIOD-END>                               DEC-26-1999             SEP-26-1999             JUN-27-1999
<CASH>                                         734,175                 689,010                 649,425
<SECURITIES>                                    16,601                  34,634                  33,426
<RECEIVABLES>                                  659,698                 602,679                 651,104
<ALLOWANCES>                                    23,144                  10,421                  12,126
<INVENTORY>                                    195,218                 273,647                 261,919
<CURRENT-ASSETS>                               263,359                 257,652               1,805,384
<PP&E>                                         516,646                 539,172                 581,716
<DEPRECIATION>                                 283,286                 267,542                 311,797
<TOTAL-ASSETS>                               2,413,851               2,457,799               2,340,681
<CURRENT-LIABILITIES>                          715,864                 718,332                 614,729
<BONDS>                                        325,627                 335,912                 337,690
                                0                       0                       0
                                          0                       0                       0
<COMMON>                                       948,693                 936,867                 895,038
<OTHER-SE>                                     341,407                 388,343                 426,478
<TOTAL-LIABILITY-AND-EQUITY>                 2,413,851               2,457,799               2,340,681
<SALES>                                      3,461,914               2,208,359               1,083,235
<TOTAL-REVENUES>                             3,461,914               2,208,359               1,083,235
<CGS>                                        2,878,235               1,893,103                 903,316
<TOTAL-COSTS>                                2,878,235               1,893,103                 903,316
<OTHER-EXPENSES>                               539,047                 371,061                 160,350
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                              21,499                  14,426                   7,208
<INCOME-PRETAX>                                 23,133                (70,231)                  12,360
<INCOME-TAX>                                    21,609                (15,859)                   4,079
<INCOME-CONTINUING>                              1,524                (54,372)                   8,281
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     1,524                (54,372)                   8,281
<EPS-BASIC>                                          0<F1>                   0<F3>                0.05
<EPS-DILUTED>                                        0<F2>                   0<F4>                0.05

<FN>
<F1>  DSS Group EPS - Primary                          0.75
      HDD Group EPS - Primary                         (1.47)
<F2>  DSS Group EPS - Diluted                          0.72
      HDD Group EPS - Diluted                         (1.47)
<F3>  From June 28, 1999 through August 3, 1999:
         Quantum EPS - Primary                        (0.15)
      From August 4, 1999 through September 26, 2000:
         DSS Group EPS - Primary                       0.08
         HDD Group EPS - Primary                      (0.60)
<F4>  From June 28, 1999 through August 3, 1999:
         Quantum EPS - Diluted                        (0.15)
      From August 4, 1999 through September 26, 2000
         DSS Group EPS - Diluted                       0.07
         HDD Group EPS - Diluted                      (0.60)
</FN>


</TABLE>



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