Oo Oo pick me!! I know the answer!
A Virtual Drive!!!
Virtual drives are software that allow you to play imaged games. You make an image from a game into your computer, using Alcohol, CloneCD or Blindwrite etc., and with the right settings, you can load it onto your virtual drive and play it like it was a real CD. A good virtual drive is Daemon Tools. Good luck and don't be afraid to post if you have any questions!!!