Velocity zone change has taken place much earlier and at the point where performance dropped from 6x to 3.?x instead of increasing to advertised 8x. I must have failed to believe/accept that zone change can be at such low address... So it's not "too early," but "indeed quite strange."It might be interesting to see what happens if speed is set to -speed=6 explicitely.
I'd guess it would manage to record at steady 6x (but do verify it, Tomasz). As mentioned the trouble apparently comes when it crosses the velocity zone boundary. It's not surprising that when you can't deliver Nx to unit, performance drops *below* what you deliver because of forced idle revolutions. The main question is why does the system in question discriminate DVD+RW in particular. A.