- Media Info (Philips DVD+R SL 16x)

- Writing - 8x Z-CLV (7.50x average) in 08:11 min

- Reading - 8x CAV

- Quality - iQB OMNI

The quality of the specific burn should be consider as good. The reflectivity (RI14) is slightly low(in the beginning of the disc while jitter is marginally higher than expected in the end of the disc. None of these should be considered as important provided that the limits for the signals are very strict.

You may also notice the spike at the ADER (Address in Pre-pit Error Rate) and ADER Unc graphs. The parameter is considered as for the DVD "+" formats only. These are part of the so-called "closed loop" signals, which are deduced when the optical head follows the track in the same way as during normal data reading. Tracking signals are switched on and the feedback coming from them allows the head to follow the groove.

There is no specification for the ADER parameters. However, practice shows that when all other features of the wobble such wobble amplitude, wobble beat or wobble CNR are within their specifications, the information encoded in the one can always be read correctly. Unfortunately our equipment does not measure these wobble-related features. Provided that the signals related to data errors (PISum8, POF, PIF) are well within the limits, we could just say that these peaks on the ADER graphs should be attributed to the Z-CLV writing strategy of the Pioneer drive: Wobble signal is used to control the rotational speed of the disc to maintain constant Linear Velocity (CLV). For DVD+R it also contains disc information and addressing data encoded through the wobble phase modulation. Provided that the ADER peaks at the graphs appear at the position where the drive increased its burning speed from 6x to 8x (6-8x Z-CLV), this sharp rise of the recording speed should be related to them.

Moreover, a strong error correction code (ECC) implemented in the wobble encoded data helps to recover any missing signals.