Full Disk Encryption

Advantages of full disk encryption:   According to researchers, full-disk encryption is hampering police forensics.

Update - 21-Mar-2012:
So, what is the best way to protect personal data on a workstation?
Is it Full Disk Encryption?

• Yeah, but what if a court orders you to reveal your password?
• Or what if a guys just steals your encrypted laptop and runs away?

Here is an article with the best solution. The solution described is around creating hidden, encrypted volumes using TrueCrypt.