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