How can I securely wipe a hard drive?

Episode 1601 (1:30:00)

Duke from Redondo Beach, CA
Solid State Drive

Duke wants to replace his hard drive. How can he get wipe the drive securely before recycling it? Leo recommends Darik's Boot and Nuke (DBAN). It uses military-grade erasing techniques to completely wipe the drives. What about those computers that aren't running? Leo says to take them out of a non-working computer and use a universal drive adapter by Newertech. Then you can connect it to a working computer and wipe the drive. You can also use SDelete from Microsoft's Sysinternals package, but go with DBAN.