[QUOTE=smartdevil;2150505]I am using BenQ DW1640 with firmware BSRB. But i am having problems burning Datawrite DVD +R DL disk with it. No matter which burners i use, it seems to have problem writing on the 2nd layer as it always fails at around 51%.[/QUOTE]
You need to use Verbatim DL media with the DW1640. It doesn’t handle other DL media that well. Verbatim is the only DL media guaranteed to work with the greatest number of DVD burners, old or new. All other DL media is of sub-par quality, and hit or miss in terms of reliability and burn consistency.