Can't enable DMA on UATA100 Fujitsu hard-drive.

[FalseChristian]

I have an ABIT-ST6RAID mobo and my 10.8GB UATA66 hard-drive has DMA enabled and is getting 53MB burst speeds but my new 40.9GB UATA100 Fujitsu hard-drive only does 7.2MB/second and I can't enable DMA on it?

Any ideas?