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Old 01-05-2006, 06:02 PM   #1
Registered: Nov 2002
Location: Lone Tree, CO
Distribution: Xubuntu Gutsy
Posts: 174

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Cannot read CD - no device assigned?

I am trying to get my DVD/CD-RW combo drive working optimally.

I have installed slackware 10.2 on a Thinkpad T43 and done the following to it:
  • Upgraded kernel to 2.6.15
  • Enabled my wireless and sata support as well as the IBM thinkpad buttons
  • Changed lilo.conf to have 'sd' boot and the given options:
  • root = /dev/sda4
  • append = "idebus=66 ide1=noprobe libata.atapi_enabled=1"

Now, the drive is being recognize, and the '/dev/sg1' is enabled for writing, but there is no dev node for reading.

Output of /proc/scsi/scsi:
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: TOSHIBA MK8032GA Rev: AB31
  Type:   Direct-Access                    ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: MATSHITA Model: DVD-RAM UJ-822S  Rev: 1.61
  Type:   CD-ROM                           ANSI SCSI revision: 05
Output of "lsscsi -g" (which I installed to try to troubleshoot the issue):
[0:0:0:0]    disk    ATA      TOSHIBA MK8032GA AB31  /dev/sda  /dev/sg0
[1:0:0:0]    cd/dvd  MATSHITA DVD-RAM UJ-822S  1.61  -         /dev/sg1
As expected the following do not work:
root@andrewslack:/dev# mount -t iso9660 /dev/scd0 /mnt/cdrom
mount: /dev/scd0 is not a valid block device
root@andrewslack:/dev# mount -t iso9660 /dev/sr0 /mnt/cdrom
mount: /dev/sr0 is not a valid block device
There is noting in dmesg that seems to identify the problem (just a lack of information perhaps).
root@andrewslack:/dev# dmesg | grep scsi
scsi0 : ata_piix
scsi1 : ata_piix
sd 0:0:0:0: Attached scsi disk sda
sd 0:0:0:0: Attached scsi generic sg0 type 0
 1:0:0:0: Attached scsi generic sg1 type 5
It seems like scd0/sr0 wasn't attached with the scsi device.

I'm stuck at this point, I'm not sure what to do next besides default back to /dev/hdc by removing the "ide1=noprobe" option from the kernel. I'd really like to get the burner working in linux (and having the DMA working, etc.)
Old 01-16-2006, 06:14 PM   #2
Registered: Aug 2003
Location: france
Distribution: suse/fedora
Posts: 105

Rep: Reputation: 15
to mount the disk to read use 'mount /dev/sg0 /mnt' ,
to burn, if your machine can detect the 'scsi1 Channel: 00 Id: 00 Lun: 00' stuff anything cdwriting frontend like Xcdroast should be fine, if the worst comes to the worst you can always use the cdrtools package direct, the manual pages are worth reading even if you never use the tools directly.
Old 01-16-2006, 07:47 PM   #3
Registered: Nov 2002
Location: Lone Tree, CO
Distribution: Xubuntu Gutsy
Posts: 174

Original Poster
Rep: Reputation: 30
I tried that, the mount gave me an "not a valid block device" error (mount -t iso9660 /dev/sg0 /mnt)
mount /dev/sg0 /mnt
gives a "you must specify the filesystem type"

From reading, sg0 is for writing, scd0 or sr0 is supposed to be for reading, is this not correct?


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