My supervisor has a laptop with a removable cd-rom, Compaq cd-rom CRN-8245B. He has used it to burn CD's in the past, and it has stopped writing discs. A blank disc says, "Cannot copy files: Files on this CD-Rom are read-only. You cannot copy or move files to this CD-Rom drive." when try to copy files to it. Has it quit working, it still reads discs, any suggestions? Thanks.