Backup takes forever to ####t in cdrom drive, but not in writer
 

I have made backups of a lot of games. I have a couple that take forever to open up though. The game Insane for example. When I go to my computer and put the backup of this game in the cdrom drive, (SOMETIMES) it takes forever for the light to go out so I can access the files, ####t the game, etc. It doesn't do this when I use my writer to ####t the disc. I am using the Clone CD ver. 3.0.5.1 and CLony XL. Clony reports the Insane CD to have read errors and wants me to use these settings : fast error skip: on , INt. Bad Sectors n I am using a Samsung model SC148-c and NEC model NR7800-A writer. ANy ideas? What am I doing wrong?Thanks a lot.