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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-END> SEP-30-2000
<CASH> 15,717
<SECURITIES> 3,872
<RECEIVABLES> 9,671
<ALLOWANCES> (1,743)
<INVENTORY> 7,099
<CURRENT-ASSETS> 36,570
<PP&E> 13,055
<DEPRECIATION> (7,629)
<TOTAL-ASSETS> 46,513
<CURRENT-LIABILITIES> 5,161
<BONDS> 0
0
0
<COMMON> 27,686
<OTHER-SE> 13,599
<TOTAL-LIABILITY-AND-EQUITY> 46,513
<SALES> 25,244
<TOTAL-REVENUES> 25,244
<CGS> 9,213
<TOTAL-COSTS> 23,348
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 4
<INCOME-PRETAX> (6,703)
<INCOME-TAX> 0
<INCOME-CONTINUING> (6,701)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (6,701)
<EPS-BASIC> (0.60)
<EPS-DILUTED> (0.60)
</TABLE>
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