$ dmesg | grep cd
cd0 at ahcich4 bus 0 scbus2 target 0 lun 0
cd0: <HL-DT-ST BDDVDRW CT10L YC07> Removable CD-ROM SCSI-0 device
cd0: Serial Number K0089QD3631
cd0: 150.000MB/s transfers (SATA 1.x, UDMA5, ATAPI 12bytes, PIO 8192bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed
cd0 at ahcich4 bus 0 scbus2 target 0 lun 0
cd0: <HL-DT-ST BDDVDRW CT10L YC07> Removable CD-ROM SCSI-0 device
cd0: Serial Number K0089QD3631
cd0: 150.000MB/s transfers (SATA 1.x, UDMA5, ATAPI 12bytes, PIO 8192bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed
cd0 at ahcich4 bus 0 scbus2 target 0 lun 0
cd0: <HL-DT-ST BDDVDRW CT10L YC07> Removable CD-ROM SCSI-0 device
cd0: Serial Number K0089QD3631
cd0: 150.000MB/s transfers (SATA 1.x, UDMA5, ATAPI 12bytes, PIO 8192bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed