Re: BD-R formatting help
Andy Polyakov wrote:
The source code change mentioned in originating post is correct and
will be included [though in modified form] to next dvd+rw-tools update.
Great, any idea when you are planning your next release?
This I can't reproduce. In other words I managed to format BD-R disc
with -ssa=4G, i.e. unit succeeded to format it with ~4GB spare area.
Have you managed to record BD-R in this particular unit at all? Same
question about BD-RE? What I'm trying to say is that the unit might
simply be broken... Another option is a kernel bug, maybe in SATA
support (as you mentioned it's SATA connected). Have you managed to
record a DVD?
I have been able to record on this drive before. As long as I don't try
to pre-format a BD-R. And I have never had any problems with the
BD-RE's. I have also been able to record DVD's with this unit.
I am going to move to a SATA unit soon, but right now I'm still
tinkering with the same kind of drive that you have.
Here's what I'm actually trying to do: I want to demonstrate to the
customer how wonderful Blu-Ray is for data integrity. I want to say
something like "see it can even detect a defect in the media on the fly
and still successfully complete a burn." I want to be able to make a
small scratch on the disc and then watch it burn around the scratch and
keep going (I have actually done this). Problem is that a small scratch
is hard to see and a large scratch is a really big chunk of disc
capacity (hence my -ssa=4G).
Side note about spare area capacity. There is something they call
TDMA, Temporary Disc Management Area, residing in Lead-In. As you
allocate spare area, part of it will be reserved for *additional* TDMA
regions. Relevant question is what part of it? MMC specification says
that default value is up to vendor and in Panasonic case it seem to be
1/2 of spare area capacity. This means that if you ask your unit for
spare area utilization data right after format, you'll see that 1/2 of
it is already used. Well, it's not actually used, but reserved for
TDMAs. Whether it's excessive or not, time will show. Meanwhile I'm
considering adding extra option to dvd+rw-format, which would allow
you to specify which portion of spare area will be reserved for TDMA. A.
Wait, are you saying that if you used -ssa=4G you are actually going to
get 2G of spare and 2G of TDMA?
Matt Schulte
Commtech, Inc.
Voice: 316-636-1131
Fax: 316-636-1163
http://www.commtech-fastcom.com
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