Re: blu ray burning with samsung se506cb in debian jessie
Jan Gregor wrote:
> After message about formatting of the media I saw about 10 lines of write
> buffer with very high estimate followed by error message
> WRITE@LBA Input/output error
So for now the best guess is that the drive does not like the medium.
> > Buffer underrun is not an issue with BD-R.
> Well, I'm not sure. In my case is default write speed is 6x and my burner
> uses USB2 port. I found some posts about recommended speed.
The specs say that DVD+R and BD-R can have more than one track
open for writing. This implies that the tracks can stand it
when writing pauses on the one track, while the other track is
> > > the drive should have buffer underrun protection.
They all have since years. But it gets into effect only if the
burn program sends a data structure called "mode page 05".
This is appropriate only for CD and DVD-. The specs say that
the drive shall ignore it with any other media type.
(They obviously obey, because last time i looked into the -V
output of cdrecord, it still sent mode page 05 to DVD+RW.)
If the BD-R is formatted and checkreading is not disabled (which
growisofs does not do) then the drive will pause with writing after
about half of a drive buffer (e.g. 1 MB) and checkread that piece
of freshly written data.
This reduces effective speed to less than half nominal speed.
Especially it would not work if buffer underruns would be an issue.
> my burner uses USB2 port.
This outrules the USB 3 timeout problems, which seem to happen with
some drives and some kernels.
Other operating system spacific problems are not known to me currently.
> > -speed=1
> I'll definitely check it.
If it helps, then it is not about a buffer underrun but rather
about the physical quality of the laser and the media dye.
(I am still curious why Dominque reduces his drive's speed regularly.)
Have a nice day :)