[Bug 1458230] Re: libburn imposing 0.2x BD-R burn (5-6 hours)

[Thomas Schmitt]

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

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https://bugs.launchpad.net/bugs/1458230

Title:
  libburn imposing 0.2x BD-R burn (5-6 hours)

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