The CDSpeed Quality score is based on only three things, and for most drives only two things:
[li]Any drive that can report PO Failures will have a QS=0% if there are any POF reported.[/li]BenQ drives can report POF but Pioneer and LiteOn drives can’t.
[li]A different QS scale is selected depending on how the drive reports PIF when scanning. There’s e.g. a different scale for drives like the LiteOn which report PIF per 1 ECC block, and another scale for drives like e.g. the Pioneer and BenQ drives which report PIF per 8 ECC blocks.[/li][li]A QS is calculated on the selected scale by looking at the maximum PIF seen per sampling interval (e.g. per 1 ECC block or 8 ECC blocks).[/li][/ol]Please note that total PIF numbers are ignored, PIE total and maximum numbers are ignored, and Jitter is ignored.
Since the LiteOn scans PIF per 1 ECC block, the QS scale says that a maximum of 2 PIF equals a QS = 95%, whereas the Pioneer scans PIF per 8 ECC blocks and the different QS scale says that a maximum of 4 PIF per 8 ECC blocks equals a QS = 98%.
In my opinion it’s almost meaningless to compare quality scores between drives that use different scales.
There’s a table somewhere showing these QS scales, but I can’t find it at the moment.
EDIT: The table can be seen here.
And with the LiteOn scan, you can see the jitter is greyed out, how can I display jitter ?
CDSpeed currently cannot scan for Jitter on any LiteOn drive.
With the right firmware you can use a tool called DVDScan to scan for Jitter (and Beta, and Tracking Error / Focus Error) on LiteOn 5S and 6S series burners with experimental firmware as well as some of the latest released firmwares.