I would like to create a disk image for Call of Duty 4 so I do not have to take the game CD with me every time I want to play the game. I created a new disk image of the disk (read only, no compression) and saved it on my desktop. When I launched the game, it did not recognize the dmg file and still requested the physical CD. I read on Apple Tech Support you could create a dmg file so you do not need the disk. Please let me know what I am doing wrong - Thanks