StorageCrypt

Have you ever forgotten your memory stick or portable hard disk drive at work, or at school? Worried about your personal data when someone steals them?
Now you do not have to be worried about you personal information, because they can be safe! There is solution with Storage Crypt.
With Storage Crypt. You can encrypt all your files such as movies, audios, documents and stop caring if someone accesses your data by stealth. It uses the 128 bit Advanced Encryption Standard (AES) for maximum security and does not store the password on the removable device. Once encrypted, the removable drive can not be opened on any computer. Storage Crypt can work on public partition. You may take it to anywhere on the fly without the software installed on each machine. 

StorageCrypt is the best solution for external drive encryption

You can find it here storagecrypt.com