You didn't state the model of HD nor Chipset.
Nevertheless, I had similar problem with my sata drive. There is one jumper that sets transferrate of the HD. In my case, it was set on 3Gb/s and Chipset (Nforce4) supports up to 2 Gb/s. The jumper sets it between 1.5 and 3 Gb/s (In my case maxtor 160 Gb).
Didn't work until I've set it on 1.5 Gb/s (which is, BTW, impossible to achive unless we talk double RAID)
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Posting Virtuoso
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