look at the /etc/fstab file.
is /dev/cdrom listed there?
if so, remove that entry and reboot
should get some message during boot like updating /etc/fstab, otherwise
you need to add /dev/hdd and the mount point, etc. to the file
just copy the entry for one of your other hd's, but with appropriate modifications of course. then reboot. will try to help you if that doesn't work. let me know.