I've lost a disc of a game that's installed to the hdd, I was wondering if there's any way to obtain a minimal sized file that the xbox will believe to be the game (Assassin's creed brotherhood) and will allow the game to boot. I don't expect a one-for-all disc but I'm sure it would be possible on a game specific basis (except that there's probably nothing available as it's largely useless as it still takes a dvd).