i'm having the same problem! i've tried so many different media and settings and i just realised after finding your post that all my problems started when i formatted and installed win 7 from vista.
the error logged reads:
Failed to Write Sectors 1732544 - 1732575 - Reason: Peripheral Device Write Fault
and happens at 50% of the dual layer disc.
i wasted 10 discs and i feel like an idiot, so posting just to let others know it could be win 7 if you are having this problem.
BTW i have a SONY BDRW BWU-200S 1.0b in this machine for reference.
