maybe your cd-rom has trouble reading the dc backups (i assume your having trouble with self booting games). I myself had trouble burning copies of copies that were self boot and i sorted my problem by reading from the cd-rewriter to an image and then burning. Also try using nero-burn with these options..
on the fly - un#####ed
read media catologue - #####ed
ignore illegal TOC - #####ed
unreadable data - continue copy
force raw - uncorrected
read audio subchannel - #####ed
ignore read errors - #####ed
And make sure your reader is set to the recorder
hope this helps......Using this method i havent made a coaster yet
Nero Rocks!!!