Ok. Since I already have a MacBook coming(Yay! White 2 Ghz) I have a question about that. If I replace the HD will this take away the motion sensor? On my fathers HP notebook It says by the HD "HP mobile data protection sytem". I think this is related to the motion sensor that stops the HD if it exeeds so many Gs. So If I replace the sixty gig with say an eighty gig will I lose the motion thing?