I have backed up my copy of Madden 07. However, it always freezes and gives me the dirty disc error. I've burned it multiple times and it keeps happening. I've burned it at it's slowest speed. The original disc also will give me this error, but not anywhere near as often. Is there anything that I can do?
Do you have compression set on your hard drive? because if thats the case that may be your issue, if so deselect compression then create your ISO.
Since the original is doing it, you might just want to bring it back to where you bought it and have it replaced. A poor original will only create poor back-ups. Either that or you just need to clean the lens.