Can create a virtual encrypted disk within a file and mount it as a real disk. It can also encrypt an entire hard disk partition or storage device. Supports plausible deniability. Open source.

PGPdisk was a stand-alone freeware program but it is now integrated with the commercial PGP package. The freeware version 6.0.2i remains available here for both Macs and PCs.

Supplier of SafeHouse encryption software for hard drives and memory sticks, including free and commercial products for business and personal use under Windows.

Supplier of DriveCrypt hard drive encryption software, and PhoneCrypt telephone encryption system.

Free "on-the-fly" transparent disk encryption program for both PCs and PDAs, allowing the creation of one or more encrypted "virtual disks". Offers features and full source code.

Control Break provides encryption and security tools which are both secure, and easy to administer - designed primarily for the large enterprise, they also offer a range of consumer versions.

Collaborative project developing a hard disk encryption system for Linux. LUKS stores configuration information in the partition header, enabling users to migrate encrypted partitions between devices.

SecuBox software provides AES disk encryption for Smartphones and Pocket PCs.

Supplier of encrypted hard drives from 30-120 Gb including FIPS 140-2 certified devices.

Supplier of SafeStick, rugged and strongly encrypted USB thumb drives, plus SafeConsole, the associated configuration and key management software for enterprise-wide use.