I had trouble with my tdk 481648
Nero would freeze or reboot the computer with dma turned on
with dma turned off the burner would burn at 4x to 1 x
no matter what the the speed was set for or the speed of the disk.
after updating all my software, VIA drivers and aspi drivers with no results.
I went back to the ole proverb if it isn’t the software then its the hardware.
in the registry under local machine/enum/scsi
I changed the DMA from 1 to 3
The soulution worked maybe it was a conflict with my dvd drive
I hop this helps out some one else