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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 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.

    --
    Jens Axboe

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