How can I wipe my hard drive completely?

Episode 1347 (1:21:37)

Josh from Denver, CO

Josh has an old HP Stream and he wants to sell it. Leo says it was a nice laptop for its day. How can he wipe his data without having to reinstall the OS? Leo says that Windows does offer recovery tools that will wipe the drive and reset it to a factory state, but it really won't completely get rid of his data. In order to really be sure, he'll need to overwrite the drive several times. Leo advises Darik's Boot and Nuke or DBAN. It'll not only format the drive, but it will overwrite it several times with 1s and 0s to military spec.