Feuer is dead on about the write caching problems with USB. Eject any usb drives, reboot and run a while - see what happens with them out.
Also - if your still having issues after that - the easiest way to do things would be using imaging. Either create - or mirror the existing drive. That way if the one dies, you unplug it, swap it with the mirror and away you go.
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Good Hunting!
Captain Haplo
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