I think I'm getting closer to finding my "missing" CDROM, but can anyone help?

I can boot from the CDROM drive (that's how I installed Knoppix) but thereafter the CDROM seems not to exist. I just get error messages that /dev/cdrom does not exist. I tried accessing it from one of the other (Windows) machines on the network, and got an error message there too, BUT there's a bit more information in the Samba log, as follows:

mount: can't find /mnt/auto/cdrom in /etc/fstab or /etc/mtab
[2005/06/10 17:50:33, 0] smbd/service.c:make_connection_snum(615)
'/mnt/auto/cdrom' does not exist or is not a directory, when connecting to [cdrom]
mount: can't find /mnt/auto/cdrom in /etc/fstab or /etc/mtab
[2005/06/10 17:50:34, 0] smbd/service.c:make_connection_snum(615)
'/mnt/auto/cdrom' does not exist or is not a directory, when connecting to [cdrom]
mount: can't find /mnt/auto/cdrom in /etc/fstab or /etc/mtab
[2005/06/10 17:50:36, 0] smbd/service.c:make_connection_snum(615)
'/mnt/auto/cdrom' does not exist or is not a directory, when connecting to [cdrom]
[2005/06/10 20:21:15, 0] smbd/server.c:main(79

It looks as if there is disagreement somewhere in the configs about where the CDROM should be mounted - /dev/ or /mnt/auto/. Can anyone give me a clue as to where to go to edit and fix that? In idiot-speak for me please!