Slow dvd writing

[H. C. Brugmans]

robot wrote:

>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?
>
>
>  
>
Do you have an nforce by any chance?
I have the same problem, and afaik, Nvidia doesn't release the 
specifications of the chip, so people can't write drivers to use it.
The same goes for a lot of hardware.