I have an external hard drive enclosure, to be honest its rather crappy, and it connects via USB 2.0. I've got my old 500GB HD from my last MacBook (2.5" SATA, 5400rpm) that I'm attempting to use as a back up drive. My problem is that every time I used SuperDuper to clone my hard drive onto the disk, it'll get half way through and then it will suddenly eject itself. I've tried it a couple of times and it always ends the same way. So far I've tried to repair the disk in Disk Utility (stops responding), reformat it (stops responding). I can transfer individuals files onto it without issue. Any suggestions?