I plan to sell my old PC. Before selling it I want to be sure that there is no personal information left on my HD. What is the best way to completely erase the HD? Previously I have used something called http://www.killdisk.com/
Is this a good way? Something better?
What if I change my mind about selling the PC and want to keep the HD and install it onto a different PC, what is the best way to clean it out then?