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Well I had came to conclusion fairly recently that it was hard drive that was causing these errors/freezes that seemed to keep getting more and more frequent with every reformat that I had to do because somthing would always go wrong.
This has been confirmed by the most recent reformat by the computer giving me the error: Format failed, your disk may be damaged.....
Anyway, I put a hard drive from my old computer in (which is a seagate: Barracuda), reformatted, and it seems to be fine.
So, I want to say don't get Maxtor HD's, I know somone else whos HD died and it was a Maxtor... he never had problems with any other brand.