TrueCrypt is a free open-source disk encryption software for Windows 7/Vista/XP, Mac OS X, and Linux. With TrueCrypt you can create virtual encrypted drives, encrypt entire partitions and removable devices or entire hard drives. Watch this tutorial by Thirdfoundation for Windows or the MAC Version by Obrien1979
This is based on an older version of TrueCrypt, but after installation you will see that it looks all the same. For the most up-to-date version go to http://www.truecrypt.org/downloads




