use Alcohol 120%

Store your most used or important CDs as images on your computer and run them at 200x speed from up to 31 virtual CD or DVD drives!
Supports the highest number of possible image file types including - MDS, CCD, BIN, CUE, ISO, CDI, BWT, BWI, BWS, BWA & many more...
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it is easy to use . i give you an example
i have a DVD-ROM . some1 gave me a movie on DVD.
i watched it then returned it to its owner
but , b4 a returned it , i used alcohol 120 to make an image / copy of the DVD that hase the movie on it
becuse i don't have a dvd-writer now . now i have in my hard disk
C: D: E: F: , G: <-dvd-rom , H: <- cd-writer , I: <- this is an image of a dvd movie
it will take space & you can make images until the letter Z. thats it

hope i helped ^_^