Messages in this thread | | | Date | Wed, 5 Nov 2003 11:12:07 +0100 | From | Jens Axboe <> | Subject | Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt |
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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 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
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