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

[Jens Axboe]

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.

-- 
Jens Axboe

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