i bought a nec 4550 after a pio 108, i noticed that burning a verbatim -r 8x at every speed 4 or 8 the dvd color is not omogeneus but it presents some circular bands that pio didn’t do, it is normal?, i want say that the dvd are good after mastering and nero infotool gives a 99-98 point of quality thanks a lot
up 
mine does that to i have no idea why it is weird though
[QUOTE=sasha7777]mine does that to i have no idea why it is weird though[/QUOTEi want only to know if it is normal, because my old one driver didn’t do that thing . thank a lot bye 
That depends on the writespeed and writemethod/-strategy used.
As long as they are readable normally, you don’t have to bother. 
These differences in color are due to the different laser power applied in different areas of the disc. That’s perfectly normal with modern drives using Z-CLV strategies and have WOPC. 
Those rings show you the zones, where writing speed was shifted up due to Z-CLV writing strategy or WOPC (Walking Optimal Power Calibration) technology.
You get an excellent result, so don’t bother on those bands/rings.