As it was explained to me, by a Dell employee who works on hard drives, it works like this…
Let's say you buy a 500 gig hard drive. and you format it and it says 498M available. What happened to the 2 mg? We assume it is for something that runs the computer. Nope. He said that is the spot for the government to access your hard drive. They have access anytime they want.
Even if they are "white hats" there is still an issue here.