I recently repartitioned and reformatted my external HD. now, he simply doesn't work anymore. time machine always hangs after exactly 5,5 Gb. tried formatting it at least 5 times. used disk EHBO . still, I can't even copy/ paste something to it without the process hanging, and the Finder with it.I can't get it to format in Windows either. I'm running 10.6.1 SL . Is my HD dead?