1)   TrueCrypt 5.0a
TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted drive. On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention.

 2)   Kakra Private Disk 2.0
Kakra Private Disk,an easy-to-use software to protect sensitive data on notebooks, personal computers, removable and flash disk. It makes a plain hard disk into a private disk that can be accessed by its owner only.