On 08/22/2015 04:10 AM, Thomas Schmitt wrote:
Hi,
Ah, a proxy-head then :-/
As a true Debian Developer he did not know any fear.
No lock function and no open(2) flag is really safe.
Hm. That's interesting...
Note well that it is about device files, not data files.
I documented our defeat:
http://libburnia-project.org/browser/libburn/trunk/doc/ddlp.txt
My current advise is to pull in the tray manually
and to wait several seconds after any blinking ended.
I.e. after the drive, hald, udev, and whatever have satisfied
their curiosity.
Only then one should start a burn run on CD-R, CD-RW,
DVD-R, and unformatted DVD-RW.
To my luck i use mainly DVD+RW and BD-RE. Burn runs
on these media tolerate stray SCSI commands from other
processes, as long as they do not alter the medium
content.
Have a nice day :)
Thomas
Wow, just...wow!
I have been struggling with writing backups and images to optical disc
for months now. I've experimented by switching among media manufacturers
and types (CD-R, CD+R, CD-RW, CD+RW, DVD-R, DVD+R, DVD-RW, DVD+RW). I've
used the various GUI interfaces and the command line writing utilities.
I've purchased new drives. All of the experimentation has resulted in
the same insanely inconsistent results. Much worse than the lost money
spent on discs and drives that don't work properly is the hours and
hours of extra time spent each week trying to write images or backups
that just fail during the burn attempt with no error messages that a
mere non-programmer like me can understand.
----
Ranting of me on park bench:
"Yes, I know the burn failed. Please tell me why. I can't even figure
out what to file a bug report against! I can't even figure out how to
word a question for the user list because the results I get are so
damned inconsistent!"
"Yes, there really IS a disc in the drive. Why are you telling me there
isn't a disc there? You just told me that disc needed to be blanked. I
blanked it. Now you're telling me there is no disc there. Really? How
far do you want me to throw you? How hard do you want me to dunk you
into the nearest dumpster?"
----
Has no one bothered to at least publish information about which disc
types work best? This information shouldn't be buried in developer or
user mail lists. It should be published on the home page of the
distribution's Web site! Seriously, that could make a huge difference in
user satisfaction for those of us who write to optical discs.
If the kernel team (or anyone else) just decided that users didn't need
reliable writing to optical disc any more, they might have bothered to
inform the user base. I guess those of us who want to perform backups or
image writes for long-term storage as part of our backup strategy are
supposed to use -- well, what?
On all of my systems I occasionally hear the optical drives being
accessed by some process. There's no rhyme or reason to it. During some
sessions I hear the drives doing their little clickety-clack every few
seconds for hours on end, and during other sessions I hear absolutely
nothing happening with the optical drives. This is with no difference in
my system or software use patterns. I guess this "are you there" crap,
along with perhaps other crap, is why I have such a hard time burning
two backup discs per week. Seriously, hours of effort every damned week
to burn two blasted DVD backup discs.
So, CD+R, CD+RW, DVD+R, DVD+RW are my best bets? (I don't have a BD
drive.) I had more or less arrived at the the same conclusion from
experimentation, but even these disc types haven't been 100% reliable.
And, hilariously, the other disc types aren't 100% unreliable.
Thank you, Thomas, for your efforts. Obviously, there must be a lot of
people out here who are as frustrated by this issue as I am. And you
must be even more frustrated by it.
Best regards,
Jape
