So I donwloaded 2.12 of the Sony Transfer Tool today on my Snow Leopard MacBook Pro. Everything works fine but I was under the impression that part of the reason for the update was to enable write back to a pro disk through the PDW-U1. That is not the case. I still have only "read access" and no write back. Anyone else in the same boat. My issue is I need to deliver my final project via XDCAM disk to its play back source.