I bought a WD 250GB external harddrive that uses a usb connection. When I was formatting it, it would unregister the drive from windows a few times before I was successful. I was thinking maybe it was just a glitch, so far all files have on it seem to be fine. However, I tried to transfer a really large 4gb file onto it and it disconnected again before it finished. During both the disconnects the drive had been on for some time and was warm to the touch. I had some similar issues with my ipod, but it has been okay in the long run. So, I'm wondering if this is just normal glitchiness with external harddrives or should i return this thing?