I usually black out the quality score because it seems totally meaningless, as it only takes into account PI fails, and also ignores the fact that high PI spikes may be disregarded under the DvD book specs. Unfortunately, those people with little knowledge of disk testing tend to view the Quality score as significant in some way. (test disk written in NEC3500 at 12x)
Here, I demonstrate the pointlessness of the Quality Score, 3 scans of the same disc. BenQ 1620 quality scan, Liteon 811s quality scan & NEC3500 speed scan
Same disk, Liteon says Quality 0, BenQ says Quality 93, NEC reads disk at top speed, so what is the significance of the Quality Score ......... NONE
Also according to the 3 scans
The Liteon 811s says disk perfect at start, failing at end
The BenQ 1620 says disk failing at start, perfect at end
The NEC3500 says disk perfect all the way through
But if you use your eyes and look at the PI errors graphs, you can see they are both very similar, with only the Liteon going a bit funny at the end.
By the way, this disk is perfectly good and reads well in evey player I own.
I am beginning to doubt the PI fails and Quality score are significent in any way, but do like the way the Jitter graph shows me the write speed of my NEC in steps starting 6x, 8x, 12x