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Re: Low burning speed



Output after another code modification:

atomasz@debian:~/instal/dvd+rw-tools-7.1$ ./growisofs -use-the-force-luke=moi -Z /dev/hdc /mnt/hda6/WinFast\ WorkArea/Poszukiwacze\ Czindici2.avi /mnt/hda6/WinFast\ WorkArea/odessa.avi /mnt/hda7/WinFast\ WorkArea/JFK.mpg /mnt/hda7/WinFast\ WorkArea/Nieukończony\ cud\ 2.mpg
WARNING: /dev/hdc already carries isofs!
About to execute 'mkisofs -quiet /mnt/hda6/WinFast WorkArea/Poszukiwacze Czindici2.avi /mnt/hda6/WinFast WorkArea/odessa.avi /mnt/hda7/WinFast WorkArea/JFK.mpg /mnt/hda7/WinFast WorkArea/Nieukończony cud 2.mpg | builtin_dd of=/dev/hdc obs=32k seek=0'
/dev/hdc: "Current Write Speed" is 8.2x1352KBps.
   27951104/4220336128 ( 0.7%) @5.9x, remaining 14:59 RBU 100.0% UBU   3.8%
   55607296/4220336128 ( 1.3%) @6.0x, remaining 11:14 RBU 100.0% UBU  80.8%
   83296256/4220336128 ( 2.0%) @6.0x, remaining 10:45 RBU 100.0% UBU  80.8%
  110985216/4220336128 ( 2.6%) @6.0x, remaining 9:52 RBU 100.0% UBU  69.2%
  138706944/4220336128 ( 3.3%) @6.0x, remaining 9:19 RBU 100.0% UBU  73.1%
  166428672/4220336128 ( 3.9%) @6.0x, remaining 9:20 RBU 100.0% UBU  80.8%
  194117632/4220336128 ( 4.6%) @6.0x, remaining 8:59 RBU 100.0% UBU  84.6%
  221806592/4220336128 ( 5.3%) @6.0x, remaining 8:42 RBU 100.0% UBU  80.8%
  232062976/4220336128 ( 5.5%) @2.2x, remaining 9:27 RBU 100.0% UBU  80.8%
  248315904/4220336128 ( 5.9%) @3.5x, remaining 9:35 RBU 100.0% UBU  15.4%
  264568832/4220336128 ( 6.3%) @3.5x, remaining 9:43 RBU 100.0% UBU  23.1%
  280690688/4220336128 ( 6.7%) @3.5x, remaining 10:03 RBU 100.0% UBU  23.1%
  296386560/4220336128 ( 7.0%) @3.4x, remaining 10:09 RBU 100.0% UBU  15.4%
  312410112/4220336128 ( 7.4%) @3.5x, remaining 10:12 RBU 100.0% UBU  15.4%
  ...
 4149411840/4220336128 (98.3%) @3.7x, remaining 0:14 RBU 100.0% UBU  11.5%
 4165959680/4220336128 (98.7%) @3.6x, remaining 0:11 RBU 100.0% UBU  15.4%
 4182147072/4220336128 (99.1%) @3.5x, remaining 0:07 RBU 100.0% UBU  26.9%
 4210491392/4220336128 (99.8%) @6.1x, remaining 0:02 RBU  29.4% UBU  23.1%
builtin_dd: 2060720*2KB out @ average 3.6x1352KBps
/dev/hdc: flushing cache
/dev/hdc: stopping de-icing
/dev/hdc: writing lead-out

So there are no SYNC CACHE or [miscalculated] sleeps involved. And as mentioned earlier (in another post) problem seem to arise when unit crosses velocity zone boundary around 220MB. This means that first, least probable, reason in my early post is even less probable or even void, because it appears as if system simply can't sustain 8x and ends up at ~1/2 of what it's capable to deliver [again, as mentioned earlier, because of forced idle revolutions].

I decided to prove that filesysyem is fast enought to write at 8x
speed so i simulated DVD-R (8x) burning and burned DVD+R (16x). There's
something strange with "+" media when it comes back to 8x after reaching
10x, however it is possible to write at 8x speed

It *appears* to be DVD+RW specific problem and the question is how come? What kernel is it? Do you have pktcdvd loaded and configured? How come there is no sign of "reloading tray" for DVD+?

BTW, could you provide dvd+rw-mediainfo for 16x DVD+R? A.


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