I have two optical drives in my desktop system: a DVD-ROM drive and a DVD rewriter.
In tc 2.6 and earlier the DVD-ROM was visible as /mnt/hdc and the rewriter as /mnt/hdd.
But since version 2.7 hdc does not show any more in /mnt.
I can still mount it manually:
sudo mkdir /mnt/hdc
sudo mount /dev/hdc /mnt/hdc
and then I can read the disc in the drive
cat /etc/fstab:
# /etc/fstab
proc /proc proc defaults 0 0
sysfs /sys sysfs defaults 0 0
devpts /dev/pts devpts defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
/dev/fd0 /mnt/fd0 auto noauto,users,exec 0 0 # Added by TC
/dev/hda1 /mnt/hda1 vfat noauto,users,exec,umask=000 0 0 # Added by TC
/dev/hda2 /mnt/hda2 ntfs noauto,users,exec,ro,umask=000 0 0 # Added by TC
/dev/hdb1 /mnt/hdb1 ntfs noauto,users,exec,ro,umask=000 0 0 # Added by TC
/dev/hdd /mnt/hdd auto noauto,users,exec 0 0 # Added by TC
cat /etc/sysconfig/cdroms
/dev/hdd /dev/hdd