ok i have looked around the forums and this seems to be a consistant problem.
Basically my plextor 712a has slowed right down when it comes to writing anything.
The answer is dma is turned off.
However when i go to device manager, and click on my dvd drive, there is no advanced options just information about the drive etc. So i cant enable dma that way.
So i tried going through plextor tools, and in the advanced options in plextor tools dma is enabled.
Yet when i go on nero info tools, dma is apparenty not enabled.
Therefore how do i enable dma again