[plug] hdparm -d1 /dev/hdc

[Craig Ringer]

>  I am having some trouble with dvd players, xine and videolan.
> Both advise turning on DMA  on the dvd device but when I try to do
> that I get
> [root at rubber]# /sbin/hdparm -d1 /dev/hdc
> /dev/hdc:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)

Possibilities include: your chipset doesn't support it, or your kernel 
doesn't support DMA on your chipset.

Craig Ringer