Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt

From: Prakash K. Cheemplavam
Date: Wed Nov 05 2003 - 05:01:40 EST

Jens Axboe wrote:
On Wed, Nov 05 2003, Prakash K. Cheemplavam wrote:

Jens Axboe wrote:

On Mon, Nov 03 2003, Prakash K. Cheemplavam wrote:


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

bash-2.05b$ md5sum /dev/cdroms/cdrom1
f73f3a74239dfe94b322b85fd14a306e /dev/cdroms/cdrom1

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.



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