mount CD/DVD.iso

sudo mount -t iso9660 -o loop /full/path/to_your_.iso /mnt

ls /mnt

The CD/DVD won't show on the desktop.

If you want it to appear on the desktop, then 

sudo mkdir /media/fakecd

sudo mount -t iso9660 -o loop /path/to/your.iso /media/fakecd

sudo umount /media/fakecd 

from:http://ubuntuforums.org/showthread.php?t=1728520