Date: Wed, 5 Nov 2003 11:01:20 +0100
From: Jens Axboe <axboe@suse.de>
To: "Prakash K. Cheemplavam" <prakashkc@gmx.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt
Message-ID: <20031105100120.GH1477@suse.de>
References: <3FA69CDF.5070908@gmx.de> <20031105084007.GZ1477@suse.de> <3FA8C916.3060702@gmx.de> <20031105095457.GG1477@suse.de> <3FA8CA87.2070201@gmx.de>
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On Wed, Nov 05 2003, Prakash K. Cheemplavam wrote:
> Jens Axboe wrote:
> >On Wed, Nov 05 2003, Prakash K. Cheemplavam wrote:
> >
> >>Jens Axboe wrote:
> >>
> >>
> >>>On Mon, Nov 03 2003, Prakash K. Cheemplavam wrote:
> >>>
> >>>
> >>>>Hi,
> >>>>
> >>>>well I am using k3b0.10.1 and either choosing cdrdao or cdrecord in 
> >>
> >>DAO mode to burn the cd ends up in non-bit identical copies, wheres ion 
> >>TAO (atleast with my 10x CD-RW I tested) the copy succeded. I tried 
> >>several times, and always got this issue.
> >>
> >>>>bash-2.05b$ md5sum livecd-2.6_10-23-2003.iso
> >>>>f73f3a74239dfe94b322b85fd14a306e livecd-2.6_10-23-2003.iso
> >>>>
> >>>>TAO:
> >>>>bash-2.05b$ md5sum /dev/cdroms/cdrom1
> >>>>f73f3a74239dfe94b322b85fd14a306e /dev/cdroms/cdrom1
> >>>>
> >>>>DAO:
> >>>>bash-2.05b$ md5sum /dev/cdroms/cdrom1
> >>>>09e7e2a51af4c64685831513fbac18c2 /dev/cdroms/cdrom1
> >>>
> >>>
> >>>
> >>>Could you please try and cmp the two images, finding out how big the
> >>>corrupted chunks are and what kind of data they contain?
> >>
> >>
> >>After some further investigation I found out, that the data is NOT 
> >>corrupted, but in a way truncated in DAO mode: When I read out the image 
> >>from the CD-RW drive, about 5kbyte are missing at the end (and doing 
> >>several burn, it is always the same amount). Strange enough if I read 
> >>the DAO burnt disk out by my DVD-ROM, the image can be read out 
> >>completely! Can you understand this behaviour? I don't think it is a 
> >>problem of my burner, but rather of the atapi driver?
> >
> >
> >Is actual data missing at the end? If yes, I'd say this looks a lot more
> >like a cdrecord problem.
> 
> Sorry, I wasn't precise: The data is on the disc, as my DVD-ROM restores 
> the full image (md5sum matches), but the CD-RW does not.

You need to use the pad option to record.

-- 
Jens Axboe

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