Encryptstick

Encrypt Stick turns your flash drive into a private vault where you store any file you want to protect. Files can be photographs, music, video, .pdf, Word, Excel, .exe and all other file types. You can create encrypted and hidden "vaults" on virtually any writable media including Mac, PC, shared network drives, external hard drives and additional USB flash drives.

Encrypt Stick dynamically sizes your vaults so that a vault only takes up the space it actually needs for storage of your sensitive information. Vaults are visible only to you and remain hidden to anyone using your computer who does not have your password and Encrypt Stick enabled flash drive.