Can't mount CD/DVD drives

[Carl Brown <cbsled@verizon.net>]

After upgrading etch, Attempts to mount the IDE optical drives produce the 
following error:

mount: wrong fs type, bad option, bad superblock on /dev/scd0,
       missing codepage or other error...

k3b finds the drives, and has no trouble burning with them, at /dev/scd0 
and /dev/scd1, except that it thinks that a CD iso needs a DVD, but it will 
copy a CD from one drive to the other error-free. KsCD plays audio CD's. 
There is clearly no hardware problem. The drives were working fine before the 
upgrade. Kernel is now 2.6.12-1-amd64-k8.

The drives had somehow renamed themselves from scd* to sr* after a previous 
upgrade. Now they will not mount as either scd* or sr*. I changed /etc/fstab 
and tried it both ways. The fstab params (except the /dev/names) are as they 
have been since the system was first installed:

/dev/sr0        /media/cdrom0   udf,iso9660 ro,user,noauto  0       0
/dev/sr1        /media/cdrom1   udf,iso9660 ro,user,noauto  0       0


These are present and correct:

$ cat /sys/block/sr0/device/model
DVD_RW ND-3540A
$ cat /sys/block/sr1/device/model
DVD_RW ND-3540A

After trying:

$ mount /dev/sr0

with a data CD-ROM or data DVD-R in the drive,
in /var/log/messages, I find:

Feb 14 08:18:10 localhost kernel: attempt to access beyond end of device
Feb 14 08:18:10 localhost kernel: sr0: rw=0, want=68, limit=4
Feb 14 08:18:10 localhost kernel: attempt to access beyond end of device
Feb 14 08:18:10 localhost kernel: sr0: rw=0, want=227992, limit=4
...
(Repeated many times with various "want=nnnnnn" numbers)
...
Feb 14 08:18:10 localhost kernel: UDF-fs: No partition found (1)
Feb 14 08:18:10 localhost kernel: attempt to access beyond end of device
Feb 14 08:18:10 localhost kernel: sr0: rw=0, want=68, limit=4
Feb 14 08:18:10 localhost kernel: isofs_fill_super: bread failed, dev=sr0, 
iso_blknum=16, block=16

"bread failed"; is my yeast stale? ;-)

-- 
Carl Brown
Whitefield, NH USA