How good is FDE (Full Disk Encryption)? According to this article it’s too good and it is causing problems for government agencies:
The protection afforded by FDE is real provided you install it properly and use a strong password. I recommend that everyone use some form of encryption on all computers, flash drives, USB drives and backup media. Encryption helps make sure that your information remains private should the items ever be lost or stolen. If you are on Windows, you get started by reading my tutorial on installing TrueCrypt. You should also refer to our Check List for other tips to help improve your security.