Re: [SLUG] thunar vs DVDs

From: Eben King (eben01@verizon.net)
Date: Fri Nov 28 2008 - 13:17:54 EST


On Fri, 28 Nov 2008, Paul Bransford wrote:

> Hmm. Try mounting the next DVD you need like this:
>
> mount -t udf,iso9660 <your normal options>

eben@pc:~$ sudo mount /dev/hda /mnt/temp -o ro -t udf,iso9660
mount: wrong fs type, bad option, bad superblock on /dev/hda,
        missing codepage or helper program, or other error
        In some cases useful info is found in syslog - try
        dmesg | tail or so

Some DVDs work. I haven't figured out why some fail.

> Also... I wonder if the udf module is getting loaded on demand properly?
> Check your dmesg and lsmod after you try mounting, see if you notice
> anything odd.

It loads:

eben@pc:~$ grep udf /proc/filesystems
eben@pc:~$ sudo modprobe udf
[sudo] password for eben:
eben@pc:~$ grep udf /proc/filesystems
         udf

When I try this:

eben@pc:~$ sudo mount /dev/hda /mnt/temp -o ro -t udf,iso9660
mount: wrong fs type, bad option, bad superblock on /dev/hda,
        missing codepage or helper program, or other error
        In some cases useful info is found in syslog - try
        dmesg | tail or so

This shows up in various logfiles:

Nov 28 13:11:03 pc kernel: attempt to access beyond end of device
Nov 28 13:11:03 pc kernel: hda: rw=0, want=68, limit=4
Nov 28 13:11:03 pc kernel: attempt to access beyond end of device
Nov 28 13:11:03 pc kernel: hda: rw=0, want=1028, limit=4
Nov 28 13:11:03 pc kernel: attempt to access beyond end of device
Nov 28 13:11:03 pc kernel: hda: rw=0, want=2052, limit=4
Nov 28 13:11:03 pc kernel: UDF-fs: No partition found (1)
Nov 28 13:11:03 pc kernel: attempt to access beyond end of device
Nov 28 13:11:03 pc kernel: hda: rw=0, want=68, limit=4
Nov 28 13:11:03 pc kernel: isofs_fill_super: bread failed, dev=hda, iso_blknum=16, block=16

Also:

eben@pc:~$ sudo file - < /dev/hda
/dev/stdin: data

eben@pc:~$ sudo od -t x1z /dev/hda | head
0000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
0004000

OK, all NULLs. Should I conclude that it's having a physical problem
reading the disc?

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