It may appear wiped but as Surfy has said it is only the "sign posts " that have been wiped. If you can imagine driving into an unknown town and trying to find a specific street...it is dead easy with a mpa....but imagine having no map.plus someone has removed all the street signs. The streets are still there but you have no way of finding that specific address....well , that is what happens when an HDD is formatted. The files are still there but windows can't find them as its map has been taken away. However special recovery programs can "sniff" them out and "recover" them.