1)   DriveCryptPlusPack 1.0c
DCPP allows you to secure your disk(s) (including removable media) with a powerful and proven encryption algorithm (AES-256) at the sector level, ensuring that only authorized users may access it.

 2)   FlashDrive Crypto 1.5
FlashDrive Crypto is an easy-to-use, reliable, user-friendly and smart program that lets you encrypt the disk partitions to keep your data secure. It almost support all kind of removable storage, eg: floppy disks, usb flash memory disk, SD, MMC ...

 3)   Icon Lock-iT XP 3.3
Icon Lock-iT XP, portable file encryption, locking, and security for Windows XP, 2000, NT Desktop files. Portable data storage security for iPod and flash drives. Secure, safe password protection. Self-decryptor for increased portability & security

 4)   Power Crypt 1.0
Power Crypt is an industrial strength file encryption program. It uses the Advanced Encryption Standard (AES) cipher algorithm, which is the most advanced and powerful encryption method used today. Encrypts in 128 bit or256 bit ciphers.