Cd does not show up under XP or Linux



I made backups of a few games on another PC, I made sure they all worked and were recognized by that PC. when I tried them on my own PC, 3 of he four simply would not show up. I used XP on both machines, and I used the exact same settings on Clone CD for all discs. Like I said I tried them on one machine, but mine refuses to recognize the cd. I would think some copy protection that would render a backup useless on one machine, would do so on all machines. Any Ideas, any advice, any RTFM (with links to the FM's) would be much appreciated. Thanx.


What make/model of cdr/cdrom drive are you using on each computer?