I've just bought my DVD-writer, and looked at it with Nero InfoTool. It reported the drive as RPCII, with 5 changes left.
Then I clicked the Hardware\devices\Properties, and under the DVD region tab set my DVD to Region 1 (although i live in a place who uses Region 2, we can get region 1 dvd's for renting).
Then i looked again with InfoTool, and to my amazement it reports the drive as RPC1 !!! how can that be???
( before i go to rent some DVD's to actually test what's happenning, I could use some of your ideas/guesses to whats going on)