Same old, same old …
According to the supported media list http://www.plextor.be/technicalservices/technology/recmedia.asp?choice=Supported%20media 18x is supported for +R Yuden and Verbatim media as well as -R Yuden and Maxell media.
According to ‘Recommended Recording Media’ page, only TaiyoYuden 16x (DVD+ and DVD-), Verbatim (MCC) 16x DVD+ and Maxell 16x DVD- media can be written at 18x.
It’s a pity.
What about Prodisc and Ritek?
That’s par for the course. Plextor drives generally offer overspeeding to Japanese developed media because they’re of higher quality than Taiwanese-developed discs from the likes of Prodisc and Ritek. Note, Verbatim discs made in Taiwan are still considered Japanese developed because the R&D is done in Japan.
And you can get it here?
Sorry, but that’s new and old!
LordCroft and hwp, you’re both right!