Hello. # uname -r 7.0-RELEASE-p1 # dmesg | grep acd acd0: DVDR <CD\^EC \^D\^PD/1.\^PB> at ata1-master UDMA33 acd1: CDRW <CD-W540E/1.0K> at ata1-slave UDMA33 # sudo atacontrol info ata1 Master: acd0 <CDC D/1.B> ATA/ATAPI revision 0 Slave: acd1 <CD-W540E/1.0K> ATA/ATAPI revision 5 But cd0 shows the right information: # dmesg | grep cd | grep -v acd cd0 at ata1 bus 0 target 0 lun 0 cd0: <_NEC DVD_RW ND-3540A 1.WB> Removable CD-ROM SCSI-0 device cd0: 33.000MB/s transfers cd0: Attempt to query device size failed: NOT READY, Medium not present cd1 at ata1 bus 0 target 1 lun 0 cd1: <TEAC CD-W540E 1.0K> Removable CD-ROM SCSI-0 device cd1: 33.000MB/s transfers cd1: Attempt to query device size failed: NOT READY, Medium not present And I have "_NEC DVD_RW ND-3540A 1.WB" in BIOS too. What's the problem? -- WBR, Alexander.