ok, check what your cdrom REALLY is called dmesg |grep CD (note capital letters)
for me i get
hdc: QSI CD-RW/DVD-ROM SBW-241, ATAPI CD/DVD-ROM drive
it is the hdc part that is interesting.
for you it could beseveral diferent; hdb. hdc. hdd. hdh, scXY, srY...

now I would write:
Code:
mount -t iso9660 /dev/hdc /mnt/cdrom
that should mount my cdrom, if i have linux installed i will edit the symlink /dev/cdrom to point to the corect device (/dev/hdc)