Eratic Buffer Levels



I have just recently installed a new Pioneer DVR-109 DVD/RW.
I am using Nero 6 Ultra Edition.
I have was burning a DVD Data disk at 8x and the Buffer Level near the bottom is constantly changing up and down from about 30% then back up to 95% and around that. Is this supposed to be so eratic? Is there any way of fixing this?



This is WOPC system : a calibration control mechanism, normal with 16X burners.

I can disable it on my BenQ 1620 drive.

With Pioneer and NEC it’s not possible.