HD não ativa DMA

["teste" <teste@ctvnet.com.br>]

Ola!
Como faço para ativar o DMA de um HD Seagate 30GB UDMA100.
já tentei o hdparm mas não deu certo, passei este comando e recebi o
seguinte:
isp:/bin# hdparm -X70 -d1 -u1 -m16 -c3 -k1 /dev/hda

/dev/hda:
 setting 32-bit I/O support flag to 3
 setting multcount to 16
 setting unmaskirq to 1 (on)
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 setting keep_settings to 1 (on)
 setting xfermode to 70 (UltraDMA mode6)
 multcount    = 16 (on)
 I/O support  =  3 (32-bit w/sync)
 unmaskirq    =  1 (on)
 using_dma    =  0 (off)
 keepsettings =  1 (on)





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