I really need to mess up a hdd with windows XP. What is the easiest and fastest way without taking it out of the case.
in the center on the back there is usually a steel disc to which there is connected a flat orange shellac cable with four wires. cut it with a razor blade in two spots so that a piece falls out and the drive is disabled.
Put it in a garbage bag and smack it several times with a sledgehammer. Transfer some of the pieces to a second bag, drive one of them to a place with a public trash can, and throw it away. Repeat for the second bag, with a different public trash can.