Re: problems writing a large file to DVD+R Double Layer disk
scdbackup@gmx.net wrote:
> Joerg Schilling:
> > There is nothing like "speudo SCSI" CD/DVD writers only work with SCSI
> > commands.
>
> That is true of course.
> The command set is always SCSI as described in sub specs
> SPC, SBC, MMC.
>
> I meant :
> Appearing under Linux as /dev/sg and /dev/sr and not as /dev/hd.
> Pseudo-Linux-SCSI. Ok ?
This looks a bit confused.
There is no problem with allowing to send raw SCSI commands through
a high level driver interface like /dev/sr* and /dev/hd* in addition
to the SCSI generic driver /dev/sg*. The problem on Linux is that
it does not allow to send raw SCSI commands through /dev/sg* if the
associated high level driver is /dev/hd* although the same type of
devices works with /dev/sg* in case that the high level driver is /dev/sr*.
The problem is also, that there are two different high level drivers
(/dev/sr* vs. /dev/hd*) for CD-ROM drives depending on the SCSI transport.
> me:
> > > Programs growisofs or cdrskin are to prefer for that.
> Joerg Schilling:
> > The preferred program still is cdrecord.
>
> But not for piping onto DVD and not for multi-session on DVD.
This is something that will change in the near future....
> Joerg, i do not want to diminish your merits about burning.
> Nevertheless, currently cdrecord imposes too much restrictions
> which cannot be justified on the level of MMC-5 specs.
Could you please avoid this kind of writing? It causes wrong
connotation at the readers side.....
The same could be said for e.g. growisofs. Growisofs artificially
limits the write mode for DVDs to what DVD+R/RW allows ignoring the
features of DVD-R/RW.
> growisofs proves it since years, i proved it this year:
> With single layer media no predicted size of the logical track
> is needed except for DVD-RW treated by e.g. cdrecord blank=fast.
> But cdrecord blank=all yields fully capable DVD-RW.
This is definitely a wrong statement. The size is only "unneded"
in case you use the less compatible packet writing mode. Cdrecord
by default implements the write mode with the best read-compatibility.
> > For double layer media, you _need_ to know the size in advance in
> > order to be able to set the layer break at the right place.
> > If you do not know this, please do not give advise....
>
> Well, i did not burn double layers yet, nor did i find anybody
> who is willing to try it. Kish Shen wants to use DVD+R/DL.
> Maybe he got one left to waste for the progress of science.
With cdrecord there is no need to test, as the tests have been done
in former times already ;-)
> Actually i advise to use growisofs for production purposes
> with DVD+R/DL.
I advise to use cdrecord for production quality media...
Jörg
--
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
js@cs.tu-berlin.de (uni)
schilling@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
Reply to: