How can I wipe my hard drive before I donate my old computer?

Episode 1243 (2:14:10)

Paul from Lake Forest, CA

Paul has an old Windows 7 computer and he's thinking of donating it. How can he wipe the drive effectively? Leo says most places that you donate to will promise to wipe the drive for you, but it's always a good idea to do it yourself to be safe. Paul should grab an external hard drive, plug it in and then drag and drop his data directly. Once he's done, he should download DBAN (Derick's Boot and Nuke). It will wipe the drive to the standards of the Department of Defense. It's very secure.

Another way to do it is to buy a cheap hard drive to replace his existing drive and just keep his original drive.