Image burning a DVD rom



I have an image of all of my computer games on my computer so I do not have to switch out the disks when I want to play and so I can store all of them and keep them safe. My question is I have the dvd version of UT2k4 and I tried burning an image but it didn’t work. Anyone know if it is different when you do it to a dvd version of a game. I was using alcohol 120% and used clony to get the protection. Thanks for any help. I am also using dameon tools as the virtual drive.