just thought i'd throw a MID out there because it's rated at 4x, but the only option for burning is 2.4x
they're samsung dvd+rw 4x
it doesn't really bother me because i use them sparingly, but since they're rated at 4x, i'd like to be able to use them at that speed.
i'm using the nec 2500a, and haven't had any problems whatsoever with RICOHJPNR01 (fuji dvd+r 4x)burning at 6x.
i'm using the official firmware v1.062003121900 that came with the drive.