what is WOPC?
The freezing happened on the first weeks, but I upgraded firmware and didn't happened again.
What about when extracting from original dvds it also creates those circles? If I put a "clean" original DVD and when I take it off it has those same circles?
Another thing I noticed, when making the speed tests available on NERO the blank DVD when the tests finish can't be recorded, during the tests the drive writes in the media. But I'm almost sure that Nero tells that no information will be written during tests.
How can I see the power supply info? I believe it has 400 W.
It can be speed changes ( in Roxio I notice the speed changing), but sometimes the recorded DVD can't be played at all.
Still the strange is that the quantity of circles differ from burning, sometimes I get almost clean burnings and sometimes the media is full of circles.
I posted a image of a latest dvd, here goes: