$ dmesg | grep cd0
acd0: CD-RW <HL-DT-ST GCE-8523B> at ata1-slave PIO4
acd0: CD-RW <HL-DT-ST GCE-8523B> at ata1-slave PIO4
cd0 at ata1 bus 0 target 1 lun 0
cd0: <HL-DT-ST CD-RW GCE-8523B 1.01> Removable CD-ROM SCSI-0 device
cd0: 16.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed