Mounting cdrom: can't read superblock

thethinker · 01-21-2008, 06:18 PM

Hey all,
Working on getting the audio on this new laptop to work with Slack 12, so I thought I'd just nab a test file from one of my CDs. I tried mounting it and I got the following message:

Code:

mount: block device /dev/cdrom is write-protected, mounting read-only
mount: /dev/cdrom: can't read superblock

My fstab looks like this:

Code:

/dev/sda3        swap             swap        defaults         0   0
/dev/sda2        /                ext2        defaults         1   1
/dev/sda1        /windows         ntfs        ro               1   0
/dev/cdrom       /mnt/cdrom       auto        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

I did some digging and found out that audio CDs use some file system called iso9660. Ok fine, so I tried that:

Code:

root@thethinker:/mnt# mount -t iso9660 /dev/cdrom /mnt/cdrom
mount: block device /dev/cdrom is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/cdrom,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

Typing in dmesg | tail gave me:

Code:

wmaster0: RX WEP frame with unknown keyidx 0 (A1=ff:ff:ff:ff:ff:ff A2=00:13:46:10:99:ea A3=00:13:46:10:99:ea)

Like 12 times. This is a brand new laptop, I've tried different CDs and it works in Vista (I am dual booting). Any thoughts?

Mr. Bond · 01-21-2008, 06:33 PM

I think iso9660 is a default type so you don`t need to type it. I don`t type that and have no problem with mounting. So that`s not a problem. Problem can be if disk is damaged. But you said that it works on Vista ... I have no clue (you are asking why then I`m typing this - well only wanted to say that iso9660 is a default).

thethinker · 01-21-2008, 06:38 PM

Well ok that's good to know. What about the fact that it's a DVD/CD drive? Could it be expecting a DVD drive and getting unhappy about it?

michaelk · 01-21-2008, 06:51 PM

FYI iso9660 is a data filesystem. The name is derived from the International Organization for Standardization (ISO) specification 9660 which describes how data is written to CD.

Audio CDs can not be mounted since they do not contain a filesystem. BTW the standard for audio CDs is known as redbook which is something like IEC 60908 which also includes CD-DA I do believe.

The windows driver can read the contents but linux can not. Actually, there is a filesystem called cdfs that can read a audio CD like windows. Its not part of the main stream kernel but there are patches.

So you will need to use one of the many apps to rip a track from the CD.

thethinker · 01-21-2008, 07:05 PM

Ah HA!! Thank you so much, I will note that and pursue another avenue.

Alien_Hominid · 01-21-2008, 11:50 PM

Actually, you can read the cds but you can't access them as a filesystem (unless, as michaelk mentioned, you'll patch your kernel). Almost all music players have an option to play music from cd.

shadowsnipes · 01-24-2008, 09:13 AM

Quote:

Originally Posted by michaelk

[...]
The windows driver can read the contents but linux can not. Actually, there is a filesystem called cdfs that can read a audio CD like windows. Its not part of the main stream kernel but there are patches.

So you will need to use one of the many apps to rip a track from the CD.

What about the FUSE filesystem cddfs? I personally haven't used it but I saw it and wondered if anyone had any experiences with it and if it would do the same thing for you that his cdfs kernel patch would do.

T3slider · 01-24-2008, 03:46 PM

I use KDE and I can just open up audio CDs in Konqueror (through media:/) and it gives me everything I would ever want. Konqueror seems to create a fake filesystem that has folders containing songs ripped to different formats (plus the original CD), which is really nifty. To rip the CD I can just copy the files from the "Ogg Vorbis" folder over to a local directory and all is done. It names them too! Very convenient. If you don't use KDE, there are, of course, many ripping programs etc., and most music programs will play audio CDs as stated above.

shadowsnipes · 01-24-2008, 04:49 PM

I use k3b in KDE to do my ripping. I don't think I even have to mount it using Konqueror (via HAL) as k3b does this for you.

T3slider · 01-24-2008, 09:53 PM

Yeah, I usually use k3b too, but thought I would point out the Konqueror thing (just because it's nifty). I was very surprised (in a good way) when I explored a CD in Konqueror for the first time (coming from a Windows world, I would NEVER expect to see such cleverness -- it's only logical to present the CD as ripped tracks since you can't actually do ANYTHING with the raw cda files anyway, on any OS).