Sometimes things don't play well together.
What kind of motherboard are you using? If it uses an NVIDIA board, it might work better with Microsoft drivers.
Does the drive work in UDMA4 if it is the only drive on the cable?
Are you using a round cable? flat ones are better (quieter).
Also it might be possible for you to select a lower DMA mode, ie UDMA2, instead of letting it use the maximum.
There are many compatibility issues with ATAPI and UDMA4, which is why many drives ship with only lower modes offered.