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

Prakash K. Cheemplavam
2003-11-05T10:00:15Z

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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