I purchased the MZ-RH1(US version) when it first was released and it works just fine. Recording or playing, I have no issues. I just purchased a MZ-NH700(AU version, which the seller failed to mention, I had just wanted a US version) and I tried to play a HI-MD disc recorded in Hi-Sp mode that I had recorded on my MZ-RH1 and the MZ-NH700 won't play the disc. It just flashes the message CANNOT PLAY. What's the deal? The disc plays fine on my MZ-RH1. Anyone have any thoughts about this?