[6817] in linux-scsi channel archive
Re: Re: Problems reading CD-ROMs with my DVD-ROM ?! (2)
daemon@ATHENA.MIT.EDU (Sven Anders)
Tue Jul 13 10:17:03 1999
Date: Tue, 13 Jul 1999 01:18:48 +0200 (MET DST)
From: Sven Anders <anderss@fmi.uni-passau.de>
To: Douglas Gilbert <dgilbert@interlog.com>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <3789158C.DE77B1A6@interlog.com>
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---559023410-64402001-931821528=:15744
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Sun, 11 Jul 1999, Douglas Gilbert wrote:
> If you wish to take a closer look at what is happening then perhaps you
> could download the utilities tarball at: http://www.torque.net/sg
>
> You will need to have the sg device driver available (either built into
> the kernel or as a module). Then try: sg_readcap /dev/sr0 [or /dev/sr1]
>
> to see what your block size is and the address of the last block. For
> example, if your block size is 2048 and the last block address is
> 332529 then try: sg_dd2048 if=/dev/sgc of=/dev/null skip=332529 count=1
>
> This utility is just like "dd" but will report any SCSI error directly
> to you (and bypasses the cdrom code). This example assumes the sg device
> /dev/sgc is the same as the cdrom driver you wish to test. Sg devices
> are allocated in the same number and order seen in 'cat /proc/scsi/scsi'.
>
> Such a test works ok for CDRs burnt on my Yamaha 4416S by cdrecord.
> However a friend who uses similar hardware and NT to burn CDRs always
> seems to get an error on the last block just as you seem to. However
> those CDRs give a "L-EC UNCORRECTABLE ERROR" error which is different
> from your report.
>
> Also the position of the error you have reported is awfully close to
> the 650 MB limit for a CDR.
Hello !
Thanks for the answers.
I tried the sg utilities and attached some of your suggested outputs.
As your can see, it works perfectly on my CD-Writer. The Problem is,
that the read with dd from the normal CD device (drivers) does not work.
Here it fails to read a whole 7 sectors, not only 2 (which seems to be
normal and would be taken care of the CD device driver!
This means a serious data loss.
The read with sg_dd2048 works perfectly.
When I try to access the last file on the CD normal with mounting the
CD all works perfectly. This seems really strange to me, because I
thought, that the file-system reads via the normal CD device drivers
which dd uses too.
Any further ideas ?!
Best regards
Sven
--
>>> "I am the embodiment of modern medicine." <<<<<<< Der Dativ ist dem <<<<<<<
>>>>>> The holographic doctor, USS-Voyager <<<<<<<<<< Genitiv sein Tod. <<<<<<<
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>> http://www.fmi.uni-passau.de/~anderss >< email: anderss@fmi.uni-passau.de <<
---559023410-64402001-931821528=:15744
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---559023410-64402001-931821528=:15744--
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