[Debburn-devel] wodim -dummy broken
Thomas Schmitt
scdbackup at gmx.net
Tue May 29 07:12:38 UTC 2007
Hi,
Chris King:
> > Maybe I'm doing something wrong but it seems like the -dummy option is
> > broken for DVD media.
Gabor Z. Papp:
> This problem confirmed by me using Plextor and +R media.
There is few hope to achieve -dummy with DVD+R media.
With CD media, -dummy is implemented by setting parameter
"Test Write" of SCSI mode page 05h.
I am not aware of any other method to cause dummy burns.
MMC-5, 7.5 says that mode page 05h applies to:
"CD-R, CD-RW (not MRW formatted), DVD-R, and DVD-RW media."
But
"If a medium is in Restricted overwrite mode, this mode page
shall not be used.
[...]
The parameters specified in this mode page are not applicable
to DVD-RAM, DVD+R, DVD+RW, all recordable BD, all recordable
HD DVD and any media that is formatted as MRW.
[...]
On CD-R/RW media the Test Write bit is valid only for Write
Type 1 or 2 (Track at Once or Session at Once). On DVD-R
media, the Test Write bit is valid only for Write Type 0 or 2
(Incremental or Disc-at-once)."
So the bug is rather in this unconditional promise made by wodim's
man page:
"The CD/DVD-Recorder will go through all steps of
the recording process, but the laser is turned off
during this procedure."
Have a nice day :)
Thomas
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