unable to mount dvd

[Lewish]

I have read all the threads on this problem. Mine seems to be very different.
Under F16, my fstab looks like this:

/dev/mapper/vg_biglew-lv_root / ext4 defaults 1 1
UUID=5d31d39b-fbe6-4f07-bcab-bbbf45ececed /boot ext4 defaults 1 2
/dev/mapper/vg_biglew-lv_home /home ext4 defaults 1 2
/dev/mapper/vg_biglew-lv_swap swap swap defaults 0 0
/dev/sr0 /media/dvd udf,iso9660 user,noauto,rw 00

The disk utility app says that the dvd is sr0. There is a directory under media "dvd".
When I attempt to mount, it says it mounted, but there are no files listed in the directory.

Any ideas?

Also, what is the "mapper" that is listed under dev?

Thanks.

[stevea]

'mapper' is used for the block layer devices (LVM and software RAID). It may also be used for loop devices. Not important here.

Your fstab is missing a space between 00.
/dev/sr0 /media/dvd udf,iso9660 user,noauto,rw 00
should be two lines
/dev/sr0<space>/media/dvd<space>ufs,iso9660<space>user,noauto,rw<space>0 <space>0


so the question is - IS the device mount ?
grep sr0 /proc/mounts
That gives the kernel's idea of what is mounted.

Post the output if it's unclear.

[Lewish]

OK, I am confused.
You said it should be two lines but wrote it as one. What did you mean?

I had ufd and you put in ufs. Which is correct?

grep sr0 /proc/mounts did not return anything. Any idea as to why?


Thanks.

[Gareth Jones]

udf is correct, and "two lines" I assume was a mistake; stevea presumably meant "two columns".

However, /etc/fstab is probably the wrong way to go about this in F16. /media is a tmpfs (unless you've changed this) so the mount-point /media/dvd will disappear on next boot – for persistent mount-points, use /mnt instead of /media. Also, if you're running one of the normal desktop environments, inserting an optical disc should cause a mount-point to automatically be created in /media and the disc to be automatically mounted, without any lines being added to /etc/fstab.

[Lewish]

Well, I think we are making progress. Changed fstab to /mnt/dvd. Created /dvd under mnt.

executed mount dvd and got this message - -

mount: block device /dev/sr0 is write-protected, mounting read-only.

OK, that seems fine, but when I go to the dvd directory and do an ls, the directory is blank (empty).

More ideas needed.

Thanks.

[Gareth Jones]

What does "mount | grep sr0" say?

[Lewish]

Strangely, grep won't return anything. I can't figure out if something is missing, or it is putting its output someplace else.

Any ideas?

[Gareth Jones]

That suggests that the DVD isn't mounted.

Try "sudo mount /dev/sr0 /mnt/dvd -o ro" – also change "rw" to "ro" in /etc/fstab.

[Lewish]

I get the same message back that I show in the above box, and still have an empty directory.

---------- Post added at 12:06 PM ---------- Previous post was at 11:54 AM ----------

Update - - after trying the above, tried to umount and got a message that the dvd was not mounted.
So, I am getting conflicting messages.

Any thoughts, anyone?

[Gareth Jones]

It's not mounted. Is there anything in /var/log/messages relating to the optical drive or mounting/unmounting file-systems?

[Lewish]

There are 3 message files there, but I can't figure out how to view them. Gedit doesn't show their contents.

Suggestions?

[Gareth Jones]

You only need the one without a number after its name – those are archived old versions. For security reasons, only root can read the logs. The easiest thing to do is to grab a snap-shot of it to you home directory:

sudo cp /var/log/messages ~/messages.txt
sudo chown your_user_name: ~/messages.txt

Then use ~/messages.txt instead.

[Lewish]

OK, there are several messages about sr0.
1. sr0: rw=0, want=3801436, limit=2097151
ISOFS: unable to read i-node block
attempt to access beyond end of device

Nine of these messages.

2. UDF-fs: warning (device sr0): udf_load_vrs: No VRS found
UDF-fs: warning (device sr0): udf_fill_super: No partition found (1)

This message occurs twice.

What are your thoughts?

Thanks,

[Lewish]

Hi kshahzad,

Did this also happen to you only after the latest software updates?

[george_toolan]

Please be more specific. What exactly is the problem?

With Fedora 16 you usually just insert a dvd and it should be automagically mounted.

But I've noticed this doesn't work anymore if gnome-shell crashed and you manually have to restart it.

Have you tried to reboot?

Do you really need this udf crap? Do you even have any udf discs? All my dvds are iso9660 ;-)

Try

mkdir /mnt/dvd
mount -r -t iso9660 /dev/sr0 /mnt/dvd
ls -l /mnt/dvd

Check /var/log/messages if there are any problems.