[Leaplist] linux can not read data DVDs???

["pberry2" at cfl.rr.com]

ray wrote:
> Mark W. Alexander wrote:
>> On Tue, Jan 30, 2007 at 11:38:43PM -0500, ray wrote:
>>   
>>> sudo mount /media/cdrom0
>>> Password:
>>> mount: block device /dev/hda is write-protected, mounting read-only
>>> mount: wrong fs type, bad option, bad superblock on /dev/hda,
>>>        missing codepage or other error
>>>        In some cases useful info is found in syslog - try
>>>        dmesg | tail  or so
>>>     
>>
>> Uhm... "Wrong fs type": What mount options are specified in /etc/fstab for
>> /media/cdrom? I suspect by it's name that it's iso9660 which is NOT what's on
>> DVD's. Maybe:
>>
>> mount -t udf /dev/[whatever] /media/cdrom0
>>
>> Or add udf to fstab, like:
>>
>> /dev/hdc        /media/cdrom0   udf,iso9660 user,noauto     0       0
>>
>> mwa
>>   
> cat /etc/fstab
> # /etc/fstab: static file system information.
> #
> # <file system> <mount point>   <type>  <options>       <dump>  <pass>
> proc            /proc           proc    defaults        0       0
> /dev/sda3       /               ext3    defaults,errors=remount-ro 
> 0       1
> /dev/sda1       /boot           ext3    defaults        0       2
> /dev/sda4       /home           ext3    defaults        0       2
> /dev/sda5       none            swap    sw              0       0
> /dev/hda        /media/cdrom0   udf,iso9660 user,noauto     0       0
> /dev/scd0       /media/cdrom1   udf,iso9660 user,noauto     0       0
> /dev/fd0        /media/floppy0  auto    rw,user,noauto  0       0
> ray at debian64:~$ sudo mount -t udf /dev/hda /media/cdrom0
> Password:
> mount: block device /dev/hda is write-protected, mounting read-only
> mount: wrong fs type, bad option, bad superblock on /dev/hda,
>        missing codepage or other error
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so
>
> ray at debian64:~$ sudo mount -t udf /dev/scd0 /media/cdrom1
> mount: No medium found
>
>
> still no  luv...
> ------------------------------------------------------------------------
>
>
>   

When I find "No medium found" errors, I change out the optical unit, 
because it means that the laser is burned out, or the circuitry is blown.
Or, in a rare instance, that the firmware is faulty.