5

THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE FINANCIAL STATEMENTS OF QUANTUM CORPORATION FOR THE QUARTER ENDED SEPTEMBER 26, 1999

1,000 6-MOS MAR-31-2000 APR-1-1999 SEP-26-1999 689,010 34,634 602,679 10,421 273,647 257,652 539,172 267,542 2,457,799 718,332 335,912 0 0 936,867 388,343 2,457,799 2,208,359 2,208,359 1,893,103 1,893,103 371,061 0 14,426 (70,231) (15,859) (54,372) 0 0 0 (54,372) 0 0 DSS Group EPS-Basic 0.44 DSS Group EPS-Diluted 0.42 HDD Group EPS-Basic (1.53) HDD Group EPS-Diluted (1.53)