Pete would like to encrypt his hard drive so nobody could use his computer unless they had the password. Leo says the easiest way to do this is to use the file lockers that the OS comes with. Windows has BitLocker, and Apple has FileVault. He can turn them on in the OS. But some people don't trust them because they don't know if there's a back door built into them for the NSA. So open source options like TrueCrypt exist. Can he just encrypt folders? Leo says absolutely. He can also encrypt external drives. But Leo uses the built-in version from the OS.