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07 Aug 2012  

Windows 7 Ultimate x64 SP1

You gave yourself the answer. If it fails the manufacturer's tests, it's a bad drive. Everything you have listed suggested a bad drive, even before you ran Seagate's tests. You can always go back to Seagate to see if it's in warranty, but since it is only a 320 GB, it is probably quite old, and might not be covered anymore.
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