My friend was trying to erase his HD, so he reformatted, ran this program http://dban.sourceforge.net/
and rewrote over it with random 1's and 0's a dozen times. Even then, the FBI forensics found traces of information about his drug heist. I don't want to make the same mistake he did, but I also do NOT want to destroy the HD by drilling holes in it and tossing it into the Atlantic Ocean. I want to keep it, but I'd like it to be the way when I first bought it, with no way to recover any information. I thought my HD was clean if I deleted all partitions, and reformatted the whole thing, but it turns out it's pretty easy to recover information if you don't somehow clean it with no way of recovering. How can I do this?