Nero 7 and DMA issue

I am having problems with some discs, and in the course of my testing, saved the error logs.

The logs say that none of my disc drives have DMA enabled, but they do. My two SATAII discs are set for that mode and DMA in the BIOS, win XP confirms that by burner is operating at UDMA 4.

Apart from the problem with the batch of discs, my burning speeds are fine and no coasters. Could my burning be slower as Nero thinks DMA is off?

TIA

Nero has problems getting the true DMA status when non-atapi drivers are installed like NVidia.

Thanks Tim. Merry Christmas.