Ok heres the deal.
I have a 20gig xbox 360 hard drive. had tons of game saves, my profile etc on it. i was playing a game and the system shut off on its own. no lock up just shut off.. now i cant connect to live to recover my gamer tag with that hdd. i think its corrupted. i did format it with the default 360 formatter. but still no luck i am using an external hdd for right now that worked. but is there a pc app that i can use to completley wipe the 360 hdd and start brand new?