Erase a whole hard drive

If you're selling your old PC, you should delete all personal information from the hard drive. But it may be impossible to get every file. And there is software that can be used to recover items deleted through the Recycle Bin.

This program can make those deleted files unrecoverable by overwriting them with meaningless data. It can wipe out everything, including Windows, to leave an essentially blank disk.

KillDisk can be put on a floppy disk. The disk can be used to boot up the computer and erase everything on the hard drive. Make sure you've made copies of anything to need to save on your new computer!

Cost: Free

Link: www.killdisk.com