You could use the following from console to identify your device;
dmesg |grep -i DVD
[ 5.459313] ata6.00: ATAPI: HL-DT-STDVD+/-RW GT32N, A203, max UDMA/100
[ 5.465965] scsi 5:0:0:0: CD-ROM HL-DT-ST DVD+-RW GT32N A203 PQ: 0 ANSI: 5
[ 5.470080] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
Notice on this machine that 'sr0' is the device: /dev/sr0'