Slow dvd writing

[robot]

I'm having a similar problem. NEC 3520A writer with 8x media that writes
at just over 2x  :sad: .

If I do hdparm /dev/dvd after bootup I get:


Code:
--------------------
    /dev/dvd:
  IO_support   =  0 (default 16-bit)
  unmaskirq    =  0 (off)
  using_dma    =  0 (off)
  keepsettings =  0 (off)
  readonly     =  0 (off)
  readahead    = 256 (on)
  HDIO_GETGEO failed: Invalid argument
--------------------



I tried running:

Code:
--------------------
    
  sudo hdparm -q -X udma2 -d1 -c1 -u1 /dev/dvd
--------------------


but get:


Code:
--------------------
    setting 32-bit IO_support flag to 1
  setting unmaskirq to 1 (on)
  setting using_dma to 1 (on)
  HDIO_SET_DMA failed: Operation not permitted
  IO_support   =  1 (32-bit)
  unmaskirq    =  1 (on)
  using_dma    =  0 (off)
--------------------



Why can't I set the DMA mode for the drive?


-- 
robot