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

[Jens Axboe <axboe@suse.de>]

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 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.
> 
> Uhm, could you be more specific? I just use the k3b frontend to burn, 
> and in the cdrdao manual I couldn't find something useful to it.

it's a cdrecord option, I've never used k3b so cannot comment on how to
make it enable that.

> SOmething else I noticed with new 2.6tes9-mm2 kernel: Now the mouse 
> stutters slighty when burning (in atapi mode). I am now using as 
> sheduler. Shoudl I try deadline or do you this it is something else? 
> Should I open a new topic?

k3b is probably still going through ide-scsi which you must not. It
would be interesting if you could try without ide-scsi and use cdrecord
manually (maybe someone more knowledgable on k3b can common on whether
they support 2.6 or not). 2.6 will be a lot faster than 2.4.

-- 
Jens Axboe