I was watching Law & Order the other night and the cops raided some kids house and seized his PC. As they went out the door, one of the guys in charge freaked out and realized that the kid had a very powerful magnet on his door frame, essentially wiping out his HD. He called it a specific name but I can't recall what it was. Is such a thing possible? I know that magnets will mess up hard drives, but to erase the whole thing that fast? Are the HDs recoverable (by govt. specs) at all after that? And what else would it affect? (Phones, mp3 players, etc.) Thanks.