I built a new computer, and my 320 gb WesternDigital hd used to work fine... but recently i've been having trouble with it. When I boot up my computer, the hard drive works just fine, but after some time, the hard drive just fails and becomes like unusable. If I have something like downloading to the drive, it displays it as an I/O error, and I get a window prompt stating like "Windows was unable to save all the data for the file F:\$Mft" But.. I don't really understand the error, cause I can still browse through the hd...really..really...slowly. Also, if I reboot my computer, then the hd works fine until it I/O errors again... but the data is fine. Help please?