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

[Prakash K. Cheemplavam]

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?

Cheers,

Prakash



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