I am sorry if this has been resolved but I could not spend the time reading through all the comments against Vista.
I had this issue, very frustrating but a logical approach found the answer and I get better performance ironically.
Disabling the Write caching from the your SATA controllers fixes the issue. If you run a benchmark before and after you may even notice the throughput being higher once disabled... I am happily getting in excess of 40Mb/sec when copying files now.
Sorry if I am way behind on this thread... I usually am!
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I am sorry if this has been resolved but I could not spend the time reading through all the comments against Vista. I had this issue, very frustrating but a logical approach found the answer and I get better performance ironically. Disabling the Write caching from the your SATA controllers fixes the issue. If you run a benchmark before and after you may even notice the throughput being higher once disabled... I am happily getting in excess of 40Mb/sec when copying files now. Sorry if I am way behind on this thread... I usually am!