bedazzled@desktop ~ $ ls -la /dev/sr?
brw-rw---- 1 root cdrom 11, 0 Sep  6 22:24 /dev/sr0
brw-rw---- 1 root cdrom 11, 1 Sep  6 22:24 /dev/sr1
brw-rw---- 1 root cdrom 11, 2 Sep  6 22:24 /dev/sr2
bedazzled@desktop ~ $ sudo hdparm /dev/sr?

/dev/sr0:
 readonly     =  0 (off)
 readahead    = 2048 (on)
 HDIO_GETGEO failed: Inappropriate ioctl for device

/dev/sr1:
 readonly     =  0 (off)
 readahead    = 2048 (on)
 HDIO_GETGEO failed: Inappropriate ioctl for device

/dev/sr2:
 readonly     =  0 (off)
 readahead    = 2048 (on)
 HDIO_GETGEO failed: Inappropriate ioctl for device