Hey, good news...! Sony have finally released the update that allows the U1 to be used as a storage device for all files i.e. we can now store BPAV folders on XDCAM HD optical discs without having to transcode them. Finally, a way to make proper use of the U1 and to get a hard copy rather than blu-ray back ups etc. Hooray!
It's an update available on the Sony website. Enjoy!!!