[webber]

you are probably trying to copy an original and all you are getting is the info off of the first portion of the gdrom, which the cdrom can read, but it will not read past it
only a gdrom can read it
try what you may but you will never be able to copy an original off of a cdrom dirve
or cdrw drive

get an image and burn that or rip using a serial cable connection from the dc to pc

regards
webber