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WinMagic SecureDoc

SecureDoc Enterprise Server

Windows, Mac OS X, Linux

Yes

None

http://www.utexas.edu/its/encrypt/

Microsoft Bitlocker

Active Directory (in some cases), Stache

Windows Vista / Windows 7

Yes

None

Windows 7 BitLocker Executive Overview

Apple FileVault 2 (1)

Stache

Mac OS X 10.7+

Partition

None

OS X: About FileVault 2

Apple FileVault (2)

Stache

Mac OS X 10.3-10.6

No

None

Mac OS X 10.6: Encrypting your home folder with FileVault

Secure virtual memory must also be enabled.

Linux Unified Key Setup (LUKS) Encryption (3)

Stache

Redhat 6+, Fedora 9+, Ubuntu 6+ -12.10 (4), Ubuntu 12.10+

Partition

None

LUKS Disk Encryption

TrueCrypt with pre-boot authentication (5)

Stache

Windows 7/Vista/XP

Windows only

Open-Source

http://www.truecrypt.org/

Self-Encrypting Drive (SED) (6) (7)

SecureDoc Enterprise Server, Stache

Windows, Mac OS X, Linux

Yes

Depends on size, storage technology, and vendor.

The SED chosen must be compliant with the OPAL specification.  Check with the vendor to ensure compliance.