My Seagate GoFlex external hard drive boots up normal when I plug it into my computer, everything looks fine until I start copying files, the copying process get stuck at certain percentage and when I try opening another folder icon box pop up says I/O device error. I tried plugging it into another laptop and it shows the hard drive present but can't access it. I'm trying to back it up to another hard drive but it wouldn't let me. Anyone know what could be the problem?