I upgraded my Z2 to the Z3 firmware and HD and the Gracenote DB on the Z3 HD Image is out of date. It didn't recognize my Metallica, Master of Puppets CD. After I updated the Gracenote DB it was able to recognize it. Out of the box, my Z2 did not recognize this disk either.
I was able to successfully burn the files to a CD using Nero 8 and following Pioneer's instructions. If someone has online storage I can make an ISO of my disk and upload it.