Each blank has a media ID, so a DVD burner identify him easily and intended by the manufacturer - can use optimal burning speed - and shared.
If the drive in its DVD recorders now the 16-blanks can not do anything with the new media code that is not Verbatim's guilt. The recorder does not recognize this "new" simply blanks. Such problems were in the early years of DVD burning everyday problems that could be solved only through diligent Firmware Updating the burner.
He should rather contact the manufacturer of its DVD recorder and ask for an update of its device firmware, rather than here Verbatim blame.
I have collected with Verbatim in all variants only the best experiences. 2x, 4x, 8x, 16x, normal DVDs, printable DVD -R / + RW no problem!