Can't mount audio/cdroms with Slackware

JockVSJock · 07-02-2006, 09:06 PM

Using Slackware 10.2 and I have an HP CD-RW for the cd player on the box.

I am unable to mount or read either cdroms or audio cds.

I do have the necessary entries under /etc/fstab, but I've never seen this before, does anyone know why this won't work?

thanks

gbonvehi · 07-02-2006, 09:09 PM

Well, you won't be able to mount audio cds because they don't have a filesystem. You can listen to them using analog method (with the audio cable from the cd to the sound card) or digital extraction one (this is not default, but it can be easily enabled on XMMS and you don't need that cable).

Do you know which is the device file assigned to the CD-RW? Try: dmesg | grep CD
and see which is the correct device.

drkstr · 07-02-2006, 09:15 PM

gbonvehi is correct, there is no file system on an audio CD. There is a pseudo file system you can try called CDFS but it's quite old, and I've never actually tried it myself. If you decide to give it a shot, let me know how it works out.

CDfs

good luck!
...aaron

JockVSJock · 07-02-2006, 09:56 PM

Quote:

Originally Posted by gbonvehi

Well, you won't be able to mount audio cds because they don't have a filesystem. You can listen to them using analog method (with the audio cable from the cd to the sound card) or digital extraction one (this is not default, but it can be easily enabled on XMMS and you don't need that cable).

Do you know which is the device file assigned to the CD-RW? Try: dmesg | grep CD
and see which is the correct device.

Ya, your right...can't mount an audio cd, but when I went to XMMS to import the files, there weren't there. I have never seen that before.

I'm getting this output

Code:

cmmiller@ladytron:~$ dmesg | grep cd
hdd: attached ide-cdrom driver.
ehci_hcd 00:02.2: PCI device 10de:00e8 (nVidia Corporation)
ehci_hcd 00:02.2: irq 10, pci mem e0a0dc00
ehci_hcd 00:02.2: USB 2.0 enabled, EHCI 1.00, driver 2003-Dec-29/2.4
cdrom: open failed.
cdrom: open failed.
cdrom: open failed.
cdrom: open failed.

gbonvehi · 07-02-2006, 11:16 PM

Check that /dev/cdrom points to /dev/hdd

Edit: Also, do another grep with CD (in caps) that should give you more info...

JockVSJock · 07-05-2006, 08:49 PM

Quote:

Originally Posted by gbonvehi

Check that /dev/cdrom points to /dev/hdd

Under dev, the cdrom is pointing at /hdc not /hdd.

This is currently how I have it under /etc/fstab

Code:

/dev/cdrom       /mnt/cdrom       auto        noauto,owner,ro  0   0

What do I need to fix to make this work?

thanks

quip · 07-05-2006, 10:08 PM

Quote:

Originally Posted by JockVSJock

Under dev, the cdrom is pointing at /hdc not /hdd.

thanks

This, coupled with your posted output earlier, would seem to indicate that cdrom is pointing to the wrong block device. You could, as root, give:

Code:

ln -s /dev/hdd /dev/cdrom

Also, check the permissions, as usual. If you do not have read permission for hdd, you could make yourself a member of that group (cdrom on my machine) by editing /etc/group to make a line read

Code:

cdrom::19:username

Your number could vary.

hitest · 07-05-2006, 11:24 PM

To play the cd as a user you need to change the permissions of /dev/hdc as /dev/cdrom links to it.
As root type: chmod 666 /dev/hdc

This command works for me when I want to set-up my unit to play audio CDs as a regular user.

JockVSJock · 07-06-2006, 08:35 PM

Quote:

Originally Posted by quip

Code:

ln -s /dev/hdd /dev/cdrom

When I issue this command as root, I get the following error

Code:

root@ladytron:/dev# ln -s /dev/hdd /dev/cdrom
ln: creating symbolic link `/dev/cdrom' to `/dev/hdd': File exists

I though about deleting the entry for the cdrom, but I've never deleted anything under /dev...

So, I'm still not able to play audio cds...

davidsrsb · 07-06-2006, 10:41 PM

What kernel are you running?
On 2.4.32 I needed the append "hdd=ide-scsi" line in lilo.conf
On 2.6.16.22 append "hdd=ide-cd"
No other symlinks or permissions changes.

jonnygraw · 07-07-2006, 12:24 AM

If you can't read the CD beause of permissions change your fstab to say:

Code:

/dev/cdrom       /mnt/cdrom       auto        noauto,user,ro  0   0

(Note: column 4 is now "user" instead of "owner")

JockVSJock · 07-07-2006, 08:27 AM

Quote:

Originally Posted by davidsrsb

What kernel are you running?
On 2.4.32 I needed the append "hdd=ide-scsi" line in lilo.conf
On 2.6.16.22 append "hdd=ide-cd"
No other symlinks or permissions changes.

Kernel 2.4.31

Does it matter where I place hdd=ide-scsi in lilo.conf?

JockVSJock · 07-07-2006, 08:28 AM

Quote:

Originally Posted by jonnygraw

If you can't read the CD beause of permissions change your fstab to say:

Code:

/dev/cdrom       /mnt/cdrom       auto        noauto,user,ro  0   0

(Note: column 4 is now "user" instead of "owner")

I've modified this and still not able to read a regular cd.

Does it matter that I'm using a cd burner to try and read these cds?

chrisortiz · 07-08-2006, 02:42 AM

Quote:

root@ladytron:/dev# ln -s /dev/hdd /dev/cdrom ln: creating symbolic link `/dev/cdrom' to `/dev/hdd': File exists

Quote:

I though about deleting the entry for the cdrom, but I've never deleted anything under /dev...

as root do

Code:

rm /dev/cdrom
ln -s /dev/hdd /dev/cdrom

don't be afraid to delete ur /dev/cdrom, its just a symbolic link.

JockVSJock · 07-09-2006, 09:42 PM

Quote:

Originally Posted by chrisortiz

as root do

Code:

rm /dev/cdrom
ln -s /dev/hdd /dev/cdrom

don't be afraid to delete ur /dev/cdrom, its just a symbolic link.

This got it...But I don't have audio...So I'll have to check that the audio cable is hooked up correctly.

thanks again