[Linux] K3b problems??? (WAS: "Fixing" failed download)

[Michael Beal]

The burn problem you are experiencing is probably related to DMA, much
the same as my issue was.

My issue with K3b was that it wouldn't burn successive discs at the
same burn rate and sometimes not at all.  Since K3b doesn't force DMA
by default since some DVD and CD drives are buggy about DMA, you have
to know your machine and do the tweaks to get it to work right.  Also,
and I'm only saying this from personal experience, NEVER burn a DVD
above 8x.  I have yet to get a functional disc after burning above 8x
in spite of having a really good 16x Dual Layer drive.  Configure your
/etc/hdparm.conf file and go from there.

And in response to the bad MD5 ISO: dude, if there are that many bad
chunks, just download it again OR have a friend with a fast connection
do it for you.


--- StephenW <winstephen@yahoo.com> wrote:

> 
> --- Larry Kagan <me@larrykagan.com> wrote:
> 
> > Sorry, my last response doesn't apply.  It's still too early for
> me.
> > 
> > Kwan Lowe wrote:
> > >> Kwan Lowe wrote:
> > >>     
> > >>> Anyone know of a way to "fix" a failed DVD ISO download?  I
> have an ISO
> > image of
> > >>> Centos 5_x64. It fails the md5sum. Because my link is so slow,
> even a
> > torrent
> > >>> download will take about 4 days at my current rate.
> > >>>
> > >>> So, given a corrupted ISO, is there a way to delete the bad
> parts and
> > re-download
> > >>> only the good?
> > >>>       
> > >> Yes. Start the torrent download. Stop it.  Move the .iso you
> have to where
> > >> the new 0 size .iso file was just created by the new torrent. 
> You want
> > >> to overwrite it with the same name.  Now start the torrent again
> and it
> > >> will check the existing file and only download the specific
> chunks that
> > >> fail checksum, not the whole thing.
> > >>     
> > >
> > > Thanks much for the feedback... I have tried this, but so far
> have not been
> > able to
> > > get this to work. The ISO I have is slightly larger than the ISO
> that the
> > torrent
> > > produces. I tried with ktorrent but it didn't mark *any* chunks
> as valid.
> > Per some
> > > searches on Google, I tried using the Azureus client and forcing
> a re-hash.
> > This
> > > also showed only a few chunks as valid. I also tried chopping off
> a few
> > bytes off
> > > the failed ISO to make it match the size of the valid (sparse)
> ISO produced
> > by the
> > > initial torrent download.
> > >
> > > Not certain if it makes a difference, but the ISO I have is
> produced from a
> > bad DVD
> > > by k3b. I think there was corruption in either the original ISO
> that
> > produced the
> > > DVD, or else the DVD itself was a failed burn.
> > >
> > > Oh well... I'm starting to doze off at my keyboard so I'll wrap
> it up for a
> > few. 
> > > Thanks again...
> 
> I have had several problems with K3B burning an iso - even when the
> checksum is
> equal.  I am told the burn was successful, etc. However, there is
> nothing on
> the disk... blank, but unusable for another try. Changing write
> speeds and
> other settings sometimes works.  Another problem is trying to burn
> more than
> one copy does not work.  Must close app and restart to burn
> successive copies.
> (Using Mepis6.5)  I have not taken time to load a different distro to
> isolate
> problem further (just waste DVDs or CDs till I get it right).
> 
> I am on vacation next week, perhaps that will give me time to do some
> checking.
> sw
> 
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> 



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