Here I need to point out one thing about write quality inspection.
Most of you using K's CD/DVD probe tool to see if the writing
quality is ok or not, but it is not enough and maybe wrong!
K's CD/DVD probe is just a tool made by LiteOnIT engineer to see
some idex of disc status, as you know like c1/c2 on CD and pi/po on DVD.
But c1/c2 or pi/po don't mean all of writing quality, and most of all, the value of pi/po is not getting from a standard testing machine(drive), it would have a large variation and become unreliable.
That's why this tool can't be used for write power and strategy adjustment. Some time we can see the pi/po value is very large but no problem for reading at most drive and some time the value is very small but read fail at most drive.
You can use K's CD/DVD probe for reference of cause, but remember one thing:
If you want to test something with a tool, please make sure the tool is suitable and not broken.