Just think of all the personal things you have on your computer. Social Security number, credit card numbers, passwords—would you want this stuff in the wrong hands?

Well, that would happen if the wrong person gets your old Mac falls. Deleting confidential information isn't good enough. You must overwrite your hard drive.

That's where Permanent Eraser comes in. This program uses the Gutmann Method. It overwrites the disk 35 times. That exceeds military standards.

You can also get the source code, if you want it.

Cost: Free

Link: www.edenwaith.com