I have noticed something about my BenQ 1620:
When WOPC is enabled, 8X burned DVD+R (my Mitsui MAM 002) seem to be have some “circles” on the burned surface ; it means that the burn was wrong, like oldest CD burners with first generation of CD-R…
When WOPC is disabled, these “circles” disappear, and the burning seems to be good! The burned surface appears like burned DVD+RW surface, so perfect! lol
So I conclued that WOPC is sh**!