Linux has grown in popularity in the past few years. Many more people are using Live CD's now than they were say 3 years ago. And with this comes a new problem for network admins. How do you stop a person from accessing certain file on the HDD that they, under Windows, would not be allowed to access, or even see. If you have a personal computer you can't really protect it either. A password on the BIOS won't work because if you remove the battery on the motherboard, wait 10 seconds, insert the battery back in, your password is gone.
How do I stop this threat?