I'm away from my PC, so I can't check the cable connections, but one of my harddrives only appears every now and again (after boot up, it's either there or not). I thought it was happening when I'd plug something else in (external hard drive, flash card etc), so wondered if it could be a configuration issue, but I noticed this morning it was missing without anything else plugged in.
Is it more likely to be a cable connection issue? Thing is that I've transferred at least 40Gb across to the disk with no apparent issues, and wouldn't have that been affected?