Re: dvd+rw tools wont burn my DVD-R(W) discs
> The media info tool gets its information from the MODE SENSE command and
> checks for the sanity of the write speed values.
> If one of these values is below 1x DVD (=1385kb/s) the values are
> considered CD-R(W) values and will not be displayed.
Correct.
> This check is not included in growisofs.
Almost correct. This check is *included* in growisofs, but it's
*performed* in DVD+ context only.
> So there are two solutions available:
> Check for sanity of the speed values of the MODE SENSE commands and
> ignore them if they seem to be CD values.
> Fix firmware and report DVD speed values in MODE SENSE command (this has
> to be done by NEC -> I already contacted their support but do not have
> an answer yet).
There is 3rd solution (which will be implemented in next update). Pull
even current write speed with GET PERFORMANCE and disregard MODE SENSE
values. Formally speaking MODE SENSE#2A is not guaranteed (well, it's
rather "specification leaves room for ambiguous interpretation" thing
than "not guaranteed" thing) to return DVD descriptors(*). It was
*empirically* found that most units seem to return sane descriptors and
this behaviour was simply assumed. The latter [assumption] has just been
proved wrong. Unfortunately pulling current write speed with GET
PERFORMANCE does not work with all units (most notably it doesn't with
Pioneer), so there will be a mix of MODE SENSE and GET PERFORMANCE...
(*) meaning that you probably shouldn't hold your breath for firmware
update from NEC:-)
Cheers. A.
Reply to: