I'm getting some problems on my external USB drive ... you know, the backup drive....the one that isn't supposed to fail. My internal drive is 4 years old and there are no indications of problems with it. The external backup drive however is tossing I/O errors. I'd like to know if it's the drive, the cable, or maybe a damaged port. I know I read on here somewhere that one of the drive testing programs can be used to test I/O cables and ports too. Anyone know which one it is? The external drive is a WD MyBook 2TB USB 2.0 type, FWIW.