Comment 1 for bug 1458230

Hi,

libburn obviously tries to tell the drive the desired speed.
But the drive decides to work much slower, despite promising
speeds up to 12x BD with the given BD-R.

A possible reason could be Defect Management which is caused
by the cdrskin option blank=format_if_needed. It checkreads
the write result after writing about half a drive buffer to
the medium.

But the xorriso run was not told to format its BD-R.
Does dvd+rw-mediainfo report it as formatted after the burn?
(I.e not
  READ FORMAT CAPACITIES:
   unformatted: 12219392*2048=25025314816
 but rather
  BD SPARE AREA INFORMATION:
   Spare Area: 196608/196608=100.0% free
)

Do you get better speed from growisofs ?
  growisofs -Z /dev/sr0=disc.iso

You could add option
  stream_recording=on
to the runs of cdrskin and xorrecord to surely disable Defect
Management.

Have a nice day :)

Thomas