f0dder, I wasn't sure of the details that it required hardware as well (magnetic tips on cantilevers scanning drive platters. Ooo..fascinating), but i was trying to make wreckedcarzz aware that wiping a hard drive isn't going to save you if you have attracted the attention of The Man.
Now if you are trying to just keep parents, spouses, significant others, siblings, and friends from sticking their collective noses into your stuff then wipe away.
The only reason I brought this up at all is because he was talking about creating a container in a decoy container with a decoy password. That's usually only done for plausible deniability when you figure you are going to be demanded to give up the password and you figure you are going to have to do it or face significant consequences not like a friend wanting it and you can tell them to step off. Well, unless he's just trying to hide his midget porn from his parents or something similar.
