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

    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?

    Prakash


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