Cryptic Disk 2.5.4
Cryptic Disk 2.5 provides a simple and affordable way to protect disks and disk partitions by encrypting them. The encrypted data cannot be accessed without entering the password, even if a hacker gets access to a PC or the hard drive is stolen. The program uses the AES 256-bit encryption algorithm, the same encryption NASA, the FBI and the Department of Defense uses to protect their data. Encrypting/decrypting takes one click. Free download.

CryptoExpert Lite 7.8.3
Freeware, CryptoExpert system mounts a volume file to create a "virtual drive" that appears to applications and users like any other physical drive. Any data that the user attempts to write to this drive is intercepted by CryptoExpert, encrypted, and written to the volume file. Attempts to read from this volume are also intercepted, and the relevant data is read by CryptoExpert from the volume file, decrypted, and presented to the application.

Dekart Private Disk Light 1.22
Free fast AES 128-bit disk encryption program. Private Disk Light allows you to create a secure space for all your work, exchange encrypted data with others, and feel sure that your information is safe from external and internal manipulation. Private Disk Light creates one or more secure virtual disks on your hard drive. Information stored in this secure area is automatically encrypted and may only be decrypted by entering the password.

Digital Secure Disk 1.5
SafeIT Secure Disk is a user-friendly program that allows you to prevent unauthorized access to restricted documents. The program makes a part of your current hard disk a secure disk. All private and confidential information stored on this disk will be protected using strong encryption. Your secure disk is only accessible by entering the correct password. The user friendly interface makes securing a file as easy as copying it.