lucid: DVDs no longer accessible

[Reinhold Rumberger]

On Wednesday 21 July 2010, D. R. Evans wrote:
> Reinhold Rumberger said the following at 07/21/2010 12:43 PM :
> > On Wednesday 21 July 2010, William Hamra wrote:
> >> this works fine on my system.... if it's DVD as you mention,
> >> you *might* need to add the -t option, it can be iso9660 or
> >> ufs, so
> > 
> >> the command becomes:
> > You mean udf?
> > 
> >> sudo mount -t iso9660 /dev/sr0 /cdrom
> >> OR
> >> sudo mount -t udf /dev/sr0 /cdrom
> 
> I hope this is a clue for someone:
> 
> ----
> 
> [HN:~] sudo mount -t udf /dev/sr0 /cdrom
> mount: block device /dev/sr0 is write-protected, mounting
> read-only mount: wrong fs type, bad option, bad superblock on
> /dev/sr0, missing codepage or helper program, or other error
> (could this be the IDE device where you in fact use ide-scsi so
> that sr0 or sda or so is needed?)
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so

Means that there is something in the drive but not udf - try
"-t auto" instead.

> [HN:~] sudo mount -t udf /dev/sr1 /cdrom
> mount: special device /dev/sr1 does not exist

Now, that one is obvious... ;-)

> I think I'm going to try to break this down, since there seem to
> be at least two issues here.
> 
> So I think the first problem is: what do I need to do to create a
> /dev/sr1 entry? (I assume that sr* is the correct name for DVD
> devices.)

You should *definitely* look in dmesg and /var/log/messages for any 
related errors or warnings - is the drive even being recognised. 
Also, checking the BIOS for both drives should be on your TODO list 
when you next get a chance to reboot.

One thing you might try, if it isn't important that device names 
don't change this once, is try to remove
/etc/udev/rules.d/70-persistent-cd.rules and "sudo restart udev".

One last thing to try is to see, whether Knoppix or some other live 
distro finds the drive.

There's always the possibility that the drive is broken, not properly 
plugged in or (in case of IDE drives) not jumpered properly. Can you 
check any of these?

  --Reinhold