I have set the write speed to 4x using the common settings in dvdfab but when nerocmd is launched it overrides the setting and burns at max. Is there a command line switch I can add to set it to 4X or even 8X?
What brand discs are you using, what is the rated speed and what is your burner model number and firmware version?
I am using Memorex -R, 16X media with a Lite-On DVDRW LH-20A1P and LH-20AIH drives with KL05 and LL06 firmware (latest from Lite-On).
Try LL07 from here: http://codeguys.rpc1.org/firmwares.html#LH-20A1H
And try some nice Verbatims or Taiyo Yuden.
I don’t use Nero but I think there is a burn setting in that program that you will have to set also, just a guess here though
Nero doesn’t remember burn speed settings…you have to select your speed for each burning instance. DVD Shrink will allow you to change the burn speed, but apparently DVDFab isn’t so supported.