free disk encryption
VeraCrypt is a free disk encryption utility allowing you to both encrypt full physical drives and make encrypted logical volumes. VeraCrypt requires admin rights to operate.
VeraCrypt Portable works best with the PortableApps.com Platform
VeraCrypt is a free disk encryption software based on TrueCrypt 7.1a. It allows secure encryption of full disks as well as virtual volumes that can be mounted on the fly. VeraCrypt has support for various encryption algorithms (AES, Serpent, TwoFish), keyfiles, security tokens, hotkeys, and more.