Can't mount cdrom (thinkpad t23; slackware 13; xfce)

fischerville · 01-05-2010, 02:43 PM

I have been working on this for three days and i've found a few posts that are similar but haven't solved my problem. I first installed Slack 13 on my Thinkpad T23 a week ago and was unable to mount from the cdrom. It was giving me an error

#> mount -t iso9660 /dev/cdrom /mnt/cdrom
/dev/hdc: unknown device

Or something similar. I followed this post, which seems to describe a similar problem, and I subsequently installed cdfs, but it didn't solve my problem.

Now i am able to mount a music cd, but not a cdrom. I'm getting this response.

#> mount -t cdfs /dev/cdrom /mnt/cdrom
mount: no medium found on /dev/hdc

For the record, here is my fstab:

Code:

/dev/hda2        /                ext4        defaults         1   1
/dev/hda1        /home            ext4        defaults         1   1
/dev/hda3        none             swap        sw
/dev/hda4        /opt             ext4        defaults         1   1
/dev/cdrom       /mnt/cdrom       cdfs        noauto,owner,ro  0   0
/dev/fd0         /mnt/floppy      auto        noauto,owner     0   0
devpts           /dev/pts         devpts      gid=5,mode=620   0   0
proc             /proc            proc        defaults         0   0
tmpfs            /dev/shm         tmpfs       defaults         0   0

and from dmesg | grep hdc

Code:

hdc: TOSHIBA DVD-ROM SD-C2512, ATAPI CD/DVD-ROM drive
hdc: host max PIO4 wanted PIO255(auto-tune) selected PIO4
hdc: UDMA/33 mode selected
ide-cd: hdc: ATAPI 24X DVD-ROM drive, 512kB Cache

Any ideas? It has occurred to me that this might be an XFCE problem.

GooseYArd · 01-05-2010, 04:07 PM

Is dmesg showing you any device errors around the time you try to mount? It sounds like an issue with the device.

fischerville · 01-05-2010, 04:35 PM

i haven't seen anything like that... here is the result from

#>tail -n 15 /var/log/dmesg

Code:

powernow: This module only works with AMD K7 CPUs
cpufreq: No nForce2 chipset.
EXT4-fs: barriers enabled
kjournald2 starting: pid 2814, dev hda1:8, commit interval 5 seconds
EXT4 FS on hda1, internal journal on hda1:8
EXT4-fs: delayed allocation enabled
EXT4-fs: file extents enabled
EXT4-fs: mballoc enabled
EXT4-fs: mounted filesystem hda1 with ordered data mode
EXT4-fs: barriers enabled
kjournald2 starting: pid 2815, dev hda4:8, commit interval 5 seconds
EXT4 FS on hda4, internal journal on hda4:8
EXT4-fs: delayed allocation enabled
EXT4-fs: mballoc enabled
EXT4-fs: mounted filesystem hda4 with ordered data mode

fischerville · 01-05-2010, 04:40 PM

Also, to be clear, i've had WinXP, Ubuntu 8.10, Ubuntu 9.04 installed on this laptop, all installed from CD or DVD. So as for the physical drive, i'm reasonably sure it's sound. As for the /dev/hdc, i haven't a clue. I'm not really clear on how much the distro and/or the desktop manager affects how the devices work.

fischerville · 01-05-2010, 05:51 PM

Another similar posting has suggests looking here, and the mappings look to be doing exactly what they say they are...

#>cat /etc/udev/rules.d/70-persistent-cd.rules

Code:

# This file was automatically generated by the //lib/udev/write_cd_rules
# program, run by the cd-aliases-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and set the $GENERATED variable.

# TOSHIBA_DVD-ROM_SD-C2512 (pci-0000:00:1f.1-ide-1:0)
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.1-ide-1:0", SYMLINK+="cdrom0", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.1-ide-1:0", SYMLINK+="cdrom", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.1-ide-1:0", SYMLINK+="dvd0", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.1-ide-1:0", SYMLINK+="dvd", ENV{GENERATED}="1"

tommyttt · 01-10-2010, 08:36 PM

Quote:

For the record, here is my fstab:
Code:

/dev/hda2 / ext4 defaults 1 1
/dev/hda1 /home ext4 defaults 1 1
/dev/hda3 none swap sw
/dev/hda4 /opt ext4 defaults 1 1
/dev/cdrom /mnt/cdrom cdfs noauto,owner,ro 0 0
/dev/fd0 /mnt/floppy auto noauto,owner 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
proc /proc proc defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0

Try changing your fstab file to make the cdrom use iso9660 and user, not owner(usually root). Also rw if you want to burn from it.
/dev/cdrom /mnt/cdrom iso9660 noauto,user,rw 0 0

Tom (retired penguin)
linxt@comcast.net

the_penguinator · 01-16-2010, 09:39 AM

Have a look in /etc/group and see if you as a user are a member of audio,video,cdrom,plugdev,power and you should also be listed as a member of netdev and scanner as well. If not, as root use your favourite text editor to add yourself to those groups. Upon restarting, all should be well.