Hello dear friends!
sorry for my bad English first.
I have a Lite-on SOHW 812s device. I tried to record DVD-R several times on different media and have failed. But i recorded DVD-RW (Digitex) without problem.
I using Nero 6.1.x.x.
But i saw interesting options in nero:
go to menu: Recorder->Choose Recorder,
then click to Options button:
and then u will see three different options. one of them is a Buffer Underun Protection Enabled, it must be checked (choosen).
Two Another are options for DVD quality recording and Media detect.
Uncheck (off) this options and u will see that all Medias will be writing without errors.