TrustyDisk

TrustyDisk is a powerfull, easy to use disk encryption program, which transparently encrypts your private data! TrustyDisk creates and supports encrypted virtual disks and these disks are visible as regular disks with correspondent drive letters. You can safely store your private data in these disks. All data stored in virtual disks are encrypted with high strength algorithm, but the applications can easily access the data, just like the access from regular disks. You should format it, create directories, files, even install software.
Main features:
Easy to use
Simulate hard disk operation to keep your habit
Access data transparent
Very fast, you will not feel a time delay
Store data anywhere
No administrator permission needed

Требования:

2000, XP, 2003, Vista