test:

TY01 (Verbatim Pastel 4x DVD+R) mast 4x on DRU700 VS04

kprobe 2.2.2 read speed 4x

reader: 832s VS04 -> PI from 10 to 13

reader: DRU700 VS04 -> PI below 0.xx

reader: 812 US0N -> PI below 0.xx

reader: 812@832 VS04 -> PI from 10 to 13

reader: Liteon 163 -> PI from 10 to 13

SAME DVD…

I think that PI 10-13 is the right result.