Re: cdrecord problems

[Bill Davidsen <davidsen@tmr.com>]

Joerg Schilling wrote:
> Bill Davidsen <davidsen@tmr.com> wrote:
>
>   
> > > Paragraph 4.3.7 "DVD+R Dual Layer" is much more detailed
> > > about the layer hop. Nevertheless there is a statement
> > > which makes me believe it is worth a try to just write
> > > to it as to a fat DVD+R.
> > >   
> > >       
> > That seems to work. I did some backups that way, creating big files and 
> > just burning them. I believe I used growisofs but I can't be sure after 
> > the fact. Reading the data back produced no read errors and a correct 
> > md5sum, I did wipe the original and test restore, though. ;-)
> >     
>
> As you don't know what you did, it is a good idea not to believe you...
>
> Not setting the layer break on DVD+R/DL may work in principle but it causes a 
> lot of headaches. If you do not set the layer break, you need to write both
> complete surfaces.
>   
Of course! That is exactly what I said I did, I wrote the data to a big 
file, ~8.2GB, then burned.

As for both complete surfaces, the last volume was only 6.7GB or so, and 
read back fine. So having to write an image covering both complete 
surfaces (what you said) doesn't seem required.. Did you ever try just 
writing an 8GB image to a DL, without specifying the layer break, to see 
what it does? Or is that a requirement of your software and not 
growisofs and the enhanced cdrecord which Fedora provides?

--
bill davidsen <davidsen@tmr.com>
 CTO TMR Associates, Inc
 Doing interesting things with small computers since 1979