Just don't let anyone else use your computer.
Exactly. Regardless of the OS, there are tons of stuff on computers you don't think about... Maybe some old keyfiles on Amiga, even? Seems a few of them have old addresses, phone numbers, etc, in them....
Why would you ever give up possesion of a computer with ANY data on it to someone you don't trust? It only takes a few minutes to start a data destroyer, and let it grind away for a few hours......
