No, you'll have to find which device it is. I'm assuming this isn't the drive you installed Slack with. On my system, it's device block hdd because it's the secondary device set to slave - making my first cdrom drive the master and therefore hdc (your hard drive is probably hda). Once you find out which device it is, make a symbolic link to it by typing this as root:
ln -sf /dev/hdd /dev/dvd (replace hdd with your device block)
And then make the directory to mount it to:
mkdir /mnt/dvd
And then adjust the /etc/fstab file by adding another line like this:
/dev/dvd /mnt/dvd iso9660 noauto,owner,ro 0 0
That should do it - just try mounting it with mount /dev/dvd.