Turning off SecureRip worked. Here's some details:

Pioneer BD-RW BDR-205 (Firmware v 1.112)
Windows 7 Professional 64bit SP1
Standard Microsoft Win 7 drivers for the Bluray drive and SATA controller
The SATA controller is built in to the motherboard and is part of the Intel X58 chipset.
Control:PC version is 2.384 (build 313)

Charlie

QNAP, MS600, MS200, Anthem AVM 50v, B&W 804S, JL Fathom 113 (2)