In my burning software. For example... If I go grab a DVD out of my movie collection, rip it to my hdd using DVD Decrypter or something to an image file then try to burn the image file to disc using pretty much any 16x certified media, the fastest speed I can pick is always 12x.
I've used the newest version of NERO, the newest version of Padus Discjuggler, used the inturnal burning software contained in DVD Decrypter etc, all with the same 12x results.
I only get 12x on the Verbatium 16x's too
I figured it was a setting but everythings setup right on the computer and in my software.
I've yet to try any DVD+R media. I generally stick to DVD-R because of compatibility issues with my home DVD player but I'm hoping this newer firmware with its bitesetting helps my player to work better with +R although thats another issue.
Maybe I'll pick up some 16x +R media and see what write speeds I get with that.