You could run, in a terminal:
which results, on one of my computers as:
Code:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 200M 0 part /boot/efi
├─sda2 8:2 0 50G 0 part /
├─sda3 8:3 0 6G 0 part [SWAP]
└─sda4 8:4 0 875.3G 0 part /home
sr0 11:0 1 1024M 0 rom
The dvd is the "rom" (read only memory), in which case you pre-pend /dev/, hence the dvd is /dev/sr0 in this case.