[QUOTE=sl_dvd;2189754]And a strange thing I noticed is that I have Verbatim DVD+R discs (MCC 004) and Verbatim DVD-R discs (MCC 03RG20) that are 16X, but when I put them in the drive, the Create Disc test allows me to choose 18X for the DVD+R disc and 20X for the DVD-R disc. Is that right? Does that mean NEC tested those media at higher than their rated speeds and determined it was OK to burn them faster?[/QUOTE]
Yes, some media can be burned at faster than the speed it is rated at or that is on the packaging. However, the results are not guaranteed to be good. All you can do is try it and see how it works. If you want to be safe though, never burn faster than a media’s rated speed.