Re: Why burnfree is off by default?
Matthias Andree wrote:
> "ROBERTOJIMENOCA@terra.es" <ROBERTOJIMENOCA@terra.es> writes:
> > Matthias Andree wrote:
> >> "ROBERTOJIMENOCA@terra.es" <ROBERTOJIMENOCA@terra.es> writes:
> >> > Could you set burnfree on by default or give a competent reason to turn
> >> > off burnfree?
> >>
> >> "Burn-proof", "Burnfree", "Just Link", "Seamless Link" or however the
> >> vendor of the day call their technique to interrupt a streaming write
> >> and pick up later where they left off always trash a few bits, it's not
> >> a perfect seamless link - the LASER needs to be switched from reading
> >> power
to writing power, the exact position needs to be used, and this
> >> isn't trivial.
> >>
> >> If I recall correctly, the
> > first generation of these techniques could
> >> "cost" near 50 bits, later ones 14 bits, I'm not sure how many bits are
> >> trashed by current implementations. "bit" here refers to either pit or
> >> land as the actual physical smallest bit of information.
> >>
> >> While the various coding layers of forward error correction codes can
> >> fix some broken bits, this also means that you are already using
> >> correcting capability for the "link", and this capability
is no longer
> >> available (already used up) to compensate for scratches, air bubbles in
> >> the polycarbonate, aging material or just a random error.
> >>
> >> For this reason it's best to not use these link capabilities but write a
> >> continuous stream. I presume that might have been a reason to leave this
> >> feature off by default. Reducing write speed is often a better
> >> alternative, and you have a -dummy mode...
> >
> > You mean that even if there's no buffer underrun the 50 bits or 14 bits
> > are always lost in writes around the disk?
>
> These bits are lost each time
Burnproof (or whatever its name) kicks in
> because the buffer has run empty.
So, If Burnproof doesn't kick in the disk is standard and if Burnproof
kicks cdrecord just could say when the cd is burned:
"Burnproof was used in this CD. Warning your CD may not be standard."
> > Otherwise that could be always left on by default and warn the user when
> > the disk write is completed that the disk used burnfree at least once
> > and may not be conformant.
>
> Well, you can use /etc/default/cdrecord to that extent. I'm using this
> on Linux 2.6 (it also sets the buffer size to 64 MB) to achieve
that:
>
> CDR_DEVICE=plex
> plex= /dev/hdd -1 64m burnfree
> nec= /dev/hdc -1 64m burnfree
We are talking about upstream defaults. My grandma always has a hard
time she has to change anything in etc with a text editor.
So, is there any reason out there to have an option that disables or
enables burnfree and just have burnfree always on by default?
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