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You need to make sure you're not copying disc-to-disc as this is not recommended.
You need to build up an image of the disc you're copying first, on your hard drive; once the image is created, your computer can supply the writer with a continous stream of data and hence avoid the buffer underrun problem.
Also note: the ability to make 100% backups depends on what hardware you have (cd-rom/writer) and what copying software you've got installed. The help file in CloneCD has a big table of compatible drives, and this program is very popular amongst the backing-up community, for all types of stuff!
Hope this helps. Bye.
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