Hello, my son must have moved the Xbox 360 and there is a scratch or ring around the center of the CD. I tried removing the ring with tooth past but no good still says disk is dirty or scratched on a certain point of the game. My question is what if I rent the same game and download it to my HD then to play the game I inset the scratched CD, will this work? Is by inserting the CD show that you have the CD and its not pirated or does it play from the CD and HD?