I recently bought NEC 3540A (with orig. firmware) and I have noticed something that I did not noticed before. Naimley, on all burned DVDs I can see concentric circles (5-8). It's like when you burn media for e.g. 50 % of it's capacity and you can see on surface which part is burned (it's less reflective).
With this new burner now I can see several alternating circles (darker-lighter-darker-lighter and then unburned area).
This my first time to see something like this, so I'm little bit confused. I'm using Traxdata DVD-R 8x, and I can read them but not on all drives. Also PI-errors are quite high on some media, 800-900. I'm using Nero 6.6.0.? Didn't noticed it on CDs.
Any help is welcomed