Problem with a CD

Problem with a CD

[Eric.Brunet]

Hi all,

In short: I have a CD that windows XP can read but that linux cannot.

I have a mini-CD (with a diameter of 8 cm) that I am trying to read. I
have tried two computers:

#1 an i386 desktop PC with an up to date FC4 (kernel 2.6.15-1.1833) and
an internal LG optical drive (CD and DVD reader/burner)

#2 an i386 laptop PC with a not so up to date FC4 (kernel 2.6.14-1.1637)
and an external (USB) ASUS optical drive (combo CD burner/DVD reader)

On both machines, under linux, I can mount the CD (iso9660 filesystem),
read the directory structure, and read all the files except two, the two
largest ones:

eric sur esquilin ~ % ls -l /media/cdrom/*/*
-r-xr-xr-x  1 root root   1315168 avr  6  2005 /media/cdrom/cdi/cdi_imag.rtf
-r-xr-xr-x  1 root root     13616 avr  6  2005 /media/cdrom/cdi/cdi_text.fnt
-r-xr-xr-x  1 root root    102400 avr  6  2005 /media/cdrom/cdi/cdi_vcd.app
-r-xr-xr-x  1 root root       193 avr  6  2005 /media/cdrom/cdi/cdi_vcd.cfg
-r-xr-xr-x  1 root root     65536 avr  6  2005 /media/cdrom/ext/lot_x.vcd
-r-xr-xr-x  1 root root        24 avr  6  2005 /media/cdrom/ext/psd_x.vcd
-r-xr-xr-x  1 root root      3606 avr  6  2005 /media/cdrom/ext/scandata.dat
-r-xr-xr-x  1 root root 192632832 avr  6  2005 /media/cdrom/mpegav/avseq01.dat
-r-xr-xr-x  1 root root      2048 avr  6  2005 /media/cdrom/vcd/entries.vcd
-r-xr-xr-x  1 root root      2048 avr  6  2005 /media/cdrom/vcd/info.vcd
-r-xr-xr-x  1 root root     65536 avr  6  2005 /media/cdrom/vcd/lot.vcd
-r-xr-xr-x  1 root root        24 avr  6  2005 /media/cdrom/vcd/psd.vcd

eric sur esquilin ~ % md5sum /media/cdrom/*/*
md5sum: /media/cdrom/cdi/cdi_imag.rtf: Erreur d'entrée/sortie
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
0ce73ce9f0954193b1e406f194ae7935  /media/cdrom/cdi/cdi_text.fnt
acd74f592e10c130b1e16fb6987062bc  /media/cdrom/cdi/cdi_vcd.app
15b32fe29124c25c7218f350b9520e29  /media/cdrom/cdi/cdi_vcd.cfg
47ee5405eb0879a36aea7d5a420d9f3a  /media/cdrom/ext/lot_x.vcd
b6219264a400936865906b925c33dcd6  /media/cdrom/ext/psd_x.vcd
c3278fbe658bf842e14ff2f33967b064  /media/cdrom/ext/scandata.dat
md5sum: /media/cdrom/mpegav/avseq01.dat: Erreur d'entrée/sortie
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
44f826b52e69fdd0398b05f06ef2ce62  /media/cdrom/vcd/entries.vcd
227a64758dcd545157873494b5cd7d8f  /media/cdrom/vcd/info.vcd
47ee5405eb0879a36aea7d5a420d9f3a  /media/cdrom/vcd/lot.vcd
b6219264a400936865906b925c33dcd6  /media/cdrom/vcd/psd.vcd


I have error messages in my logs:
on computer #1, they look like:
|hdc: command error: status=0x51 { DriveReady SeekComplete Error }
|hdc: command error: error=0x54 { AbortedCommand LastFailedSense=0x05 }
|ide: failed opcode was: unknown
|end_request: I/O error, dev hdc, sector 5008
|Buffer I/O error on device hdc, logical block 1252
on computer #2, they are simpler:
|end_request: I/O error, dev sr0, sector 5008
|Buffer I/O error on device sr0, logical block 1252

On both computers, I have the errors on the same sectors/blocks.

For the two offending files, the errors already occur on the beginings of
the files.

Of course, all of this point to a defective CD, except that on both
computers, I can read the files without any problem with windows XP
(well, actually, I have only read avseq01.dat, which is a video file. I
haven't tried the other troublesome file.)

What could be the problem ?

Éric

Re: Problem with a CD

[Robert Hancock]

Eric.Brunet@lps.ens.fr wrote:
> I have error messages in my logs:
> on computer #1, they look like:
> |hdc: command error: status=0x51 { DriveReady SeekComplete Error }
> |hdc: command error: error=0x54 { AbortedCommand LastFailedSense=0x05 }
> |ide: failed opcode was: unknown
> |end_request: I/O error, dev hdc, sector 5008
> |Buffer I/O error on device hdc, logical block 1252
> on computer #2, they are simpler:
> |end_request: I/O error, dev sr0, sector 5008
> |Buffer I/O error on device sr0, logical block 1252
> 
> On both computers, I have the errors on the same sectors/blocks.
> 
> For the two offending files, the errors already occur on the beginings of
> the files.
> 
> Of course, all of this point to a defective CD, except that on both
> computers, I can read the files without any problem with windows XP
> (well, actually, I have only read avseq01.dat, which is a video file. I
> haven't tried the other troublesome file.)
> 
> What could be the problem ?

This is a VCD, right? Those use Mode 2 Form 2 which has weak error 
correction (like an audio CD). It's possible the drive is returning read 
errors and WinXP is ignoring the errors because it's a VCD, and Linux is 
not..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/

Re: Problem with a CD

[Måns Rullgård]

Eric.Brunet@lps.ens.fr writes:

> Hi all,
>
> In short: I have a CD that windows XP can read but that linux cannot.
>
> I have a mini-CD (with a diameter of 8 cm) that I am trying to read. I
> have tried two computers:

[...]

> I have error messages in my logs:
> on computer #1, they look like:
> |hdc: command error: status=0x51 { DriveReady SeekComplete Error }
> |hdc: command error: error=0x54 { AbortedCommand LastFailedSense=0x05 }
> |ide: failed opcode was: unknown
> |end_request: I/O error, dev hdc, sector 5008
> |Buffer I/O error on device hdc, logical block 1252
> on computer #2, they are simpler:
> |end_request: I/O error, dev sr0, sector 5008
> |Buffer I/O error on device sr0, logical block 1252
>
> On both computers, I have the errors on the same sectors/blocks.
>
> For the two offending files, the errors already occur on the beginings of
> the files.
>
> Of course, all of this point to a defective CD, except that on both
> computers, I can read the files without any problem with windows XP
> (well, actually, I have only read avseq01.dat, which is a video file. I
> haven't tried the other troublesome file.)

Do you have any way of checking whether windows reads the file
correctly, or just fails to detect the error?

-- 
Måns Rullgård
mru@inprovide.com

Re: Problem with a CD

[Patrick Mau]

On Sun, Mar 12, 2006 at 05:28:25PM +0100, Eric.Brunet@lps.ens.fr wrote:
> Hi all,

Hi Eric,

<snip>

> eric sur esquilin ~ % md5sum /media/cdrom/*/*
> md5sum: /media/cdrom/cdi/cdi_imag.rtf: Erreur d'entrée/sortie
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 0ce73ce9f0954193b1e406f194ae7935  /media/cdrom/cdi/cdi_text.fnt
> acd74f592e10c130b1e16fb6987062bc  /media/cdrom/cdi/cdi_vcd.app
> 15b32fe29124c25c7218f350b9520e29  /media/cdrom/cdi/cdi_vcd.cfg
> 47ee5405eb0879a36aea7d5a420d9f3a  /media/cdrom/ext/lot_x.vcd
> b6219264a400936865906b925c33dcd6  /media/cdrom/ext/psd_x.vcd
> c3278fbe658bf842e14ff2f33967b064  /media/cdrom/ext/scandata.dat
> md5sum: /media/cdrom/mpegav/avseq01.dat: Erreur d'entrée/sortie
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 44f826b52e69fdd0398b05f06ef2ce62  /media/cdrom/vcd/entries.vcd
> 227a64758dcd545157873494b5cd7d8f  /media/cdrom/vcd/info.vcd
> 47ee5405eb0879a36aea7d5a420d9f3a  /media/cdrom/vcd/lot.vcd
> b6219264a400936865906b925c33dcd6  /media/cdrom/vcd/psd.vcd

> What could be the problem ?

Since this is a video cd, the files associated with the stream cannot
be accessed by mounting the medium. The filesystem of VCD is not a
normal filesystem, so you have to rip the video stream by using a tool
like vcdxrip.

On Debian the package is called 'vcdimager'.

Best regards,
Patrick

Re: Problem with a CD

[Jan Engelhardt]

>On Sun, Mar 12, 2006 at 05:28:25PM +0100, Eric.Brunet@lps.ens.fr wrote:
>>>In short: I have a CD that windows XP can read but that linux cannot.
>>>What could be the problem ?
>
>Since this is a video cd, the files associated with the stream cannot
>be accessed by mounting the medium.

It's because the video data is outside the iso9660 fs, is not it?

>The filesystem of VCD is not a
>normal filesystem, so you have to rip the video stream by using a tool
>like vcdxrip.


Jan Engelhardt
-- 

Re: Problem with a CD

[Eric.Brunet]

On Sun, Mar 12, 2006 at 09:53:30PM +0100, Jan Engelhardt wrote:
> >
> >Since this is a video cd, the files associated with the stream cannot
> >be accessed by mounting the medium.
> 
> It's because the video data is outside the iso9660 fs, is not it?
> 
> >The filesystem of VCD is not a
> >normal filesystem, so you have to rip the video stream by using a tool
> >like vcdxrip.

Ah, ok. Sorry for the noise. I had never seen a VCD before. I just tried
to do
	xine vcd:// 
one one of the computers and it worked perfectly.

However, under windows, what I did was simply to open the disc in the
explorer, look at the files, right-click on the largest file to open it
with windows media player, or drag and drop it to copy it on the hard
drive, without any special tool.

I find it a bit deceptive that linux lets me mount the filesystem but not
access the files. It would be actually better, I feel, if mount
would refuse to work on a vcd and display some informative failure
message rather than mount an unreadable filesystem...

Thanks,

	Éric