KillDisk -
Link
A great program to wipe your hard disk. It creates a bootable floppy with the program on it. Completely wipes info on your disk. You can also do multiple passes (freeware version, you have to reboot to do another pass).
Quote from Web Site:
"Active@ KillDisk - Hard Drive Eraser is powerful and compact DOS software that allows you to destroy all data on hard and floppy drives completely, excluding any possibility of future recovery of deleted files and folders. It's a hard drive eraser utility.
If you use FDISK, FORMAT utilities, or DELETE standard operating system command for data removal, there is always a chance to recover deleted data and use against owner's will. We highly recommend you to run this FREE utility for the hard and floppy drives you want to dispose of, recycle, re-use, sell or donate to somebody.
Active@ KillDisk conforms to US Department of Defense clearing and sanitizing standard DoD 5220.22-M. You can be sure that once you clean up with Active@ KillDisk, sensitive information is purged out forever."