or probably you desire to develop something like a virtual cd drive, whcih can be used to save a copy of a cd on you hard drive and then when you run the application it will behave as if a cd is there in the cd drive. This sort of utility is usually used when you want to play a game ( or any other application for that matter ) which requires the original cd to be in your drive to be able to run it ... and obviously you don't have one ...

Cheers,
Amit Ray.