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Well ive never tried to create a Mini Image using Nero?
Download a trial version of
Alcohol 120% and go
here to learn more about creating Safedisc Mini Images.
EDIT: Sorry I just noticed you didnt mention anything about a mini image! But just follow the same steps on the mini image tutorial but dont cancel the image, let it go all the way thru the reading of your disc. Then you will have a full image.