I've got the same issue. Neither data DVD nor data CD write properly. They all come out blank.
The entire process from start to finish seems to be going fine according to the dialog boxes that pop up.
Using NEC Optiarc AD-7170A and TDK DVD-R recordable DVDs, and Sony CDRs
Using windows XP professional and Express burn 4.09
Windows writes to CDR fine. There is no problem with the drive itself.
Can anyone at NCH reply?