Tom's Hardware: Topic AP-1680 Raid controller problem
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If you use those drives in RAID then it is not the card causing the problems. The Barracuda IV (and it seems like also the V) suck in RAID performance.
But if you don't use them in a RAID array then it is lickely that they're not running at the right DMA mode. Check if the correct DMA mode is set inside the RAID-card BIOS and see if your OS has DMA enabled... Win2k seems to disable DMA66 for default.
My dual-PSU PC is so powerfull that the neighbourhood dims when I turn it on 
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