[NTLUG:Discuss] K3b question

[Leroy Tennison]

On 06/11/2011 01:17 PM, Fred James wrote:
> erich wrote:
>> Are you sure,
>>           This is a k3b problem? Maybe you mean *,iso.md5sum. When 
>> you get
>> an *.iso file from online. You also get an *.iso.md5sum. K3b Takes 
>> these two
>> files and flies with them.
>>
>>                                                                                                            
>> Erich
>>
>> Fred James wrote:
>>> I have never seen this one before and I would appreciate any clues ...
>>> Downloaded some iso files (some CD and some DVD) ... all of them 
>>> check out OK for sums (both md5 and sha1)
>>> But one file (619.0 MB) always fails the write verification ... the 
>>> others pass.
>>> I even downloaded the suspect file a second time ... it too passed 
>>> the sums, but failed the write verification
>>>
>>> One of the files that passes verification is 692.0 MB, so it can't 
>>> be size ... anyway it is a 700 MB CD-R disk
>>> Thank you
>>> Regards
>>> Fred James
>>>
>>> Mandriva 2008.0
>>> K3b 1.0.3 (Using KDE 3.5.7)
> Erich
> 1st ... I am not sure of anything
> 2nd ... the process, step by step ...
> (a) download *.iso
> (b) download *.iso.md5
> (c) download *.iso.sha1
> (d) cat *.iso.md5 > file1
> (e) cat *.iso.sha1 >> file1
> (f) md5sum *.iso > file2
> (g) sha1sum *.iso >> file2
> (h) diff file1 file2
> (i) if no difference, then sums check out OK
> (j) start ISO write process in K3b, with verify written data checked
> (j.1) K3b, of course checks the md5 sum, and it is OK, too
> (j.2) write succeeds
> (j.3) verify fails (says the original and the written don't match)
> (j.3.1) does not give fail until verify secession is complete
> (j.3.2) I have not found another error message or any other explanation
> 3rd ... history ...
> (a) I have downloaded 2 DVD ISO's and 4 CD ISO's (and one of the CD's 
> twice, as mentioned above)
> (b) both DVD files have written and verified OK
> (c) 3 of the CD files have written and verified OK
> (d) 1 of the CD files (and just that one - the one I have downloaded 
> twice) has written successfully, but failed on verify
> (d.1) 6 fails on the first download, and 1 on the second ... I may 
> learn slow, but I do learn
> (d.2) after the 6 fails, I wrote and verified a different CD file just 
> to verify that ...
> (d.2.1) the drive is still OK
> (d.2.2) the blank CD-R's were OK ... a moot point since the other 
> files were all writing on this batch of CD-R's
>
> My guess (operative word being guess) is that the K3b software is OK, 
> the CD-R's are OK, and the DVD/CD drive is OK
>
> My original statement was that I have never seen this before, and I do 
> wonder what it might be.
>
> Hope that isn't TMI
> Thanks
> Regards
> Fred James
>
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>
You're not alone, I get this on CentOS 5.??? (point releases upgrade 
every so often).  An ugly option if you can mount the CD, mount it and 
the ISO then 'diff -r ...'