dvd shrink is an awesome program.
make an ISO of the cd/dvd using Alcohol 120%. Then mount the ISO on the virtual drive that the program creates. You can see the exact bit-for-bit copy of it on your computer without the disc. Works great for games that require the cd too. Keep in mind the ISO (or image) will at least be as big as the information on the disc. An hour long dvd can be around 8 GB.