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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 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.

    Prakash



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