DriveCrypt is the worlds most used 1334 bit hard disk encryption software. It uses virtual container as well as partition encryption and can hide data in music files.

Version: 5.1.0DriveCrypt securely and easily protects all proprietary data on notebooks and desktop computers 100% of the time without users having to worry about security.
License: Free To Try $59.95
Operating System: Windows
Homepage: www.securstar.com
Developed by:
Any organization, from a small company to a large international firm with thousands of users in the field, can effectively protect business plans, client lists, product specifications, confidential corporate memos, stock information, and much more with this product. As data is read from the hard disk, DriveCrypt automatically decrypts the data before it is loaded into memory. When data is written back to the hard disk, it is automatically re-encrypted.
The encryption / decryption process is completely transparent to the user or any application program - the data is caught "on-the-fly" as it transfers back and forth between the hard disk and memory. Consequently, users don't need to remember to decrypt or re-encrypt their data, or change the normal operation of the PC.
In addition, only individual files are decrypted at any given time, not the whole hard disk.
What's New
Version 5.0: * Brand new GUI with resizable windows and extensive use of tooltips. * Two modes of GUI operation - advanced and simple mode for experienced and novice users. * Simple mode offers an easy to use, intuitive, single-click environment to create and mount existing disks. And more.
Version 4.61: completely revised version.
Version 4.4: completely revised version invisible disk support