Hi again. I did a little searching around, as I'm still working this all out for myself. As well as the thread johnwesleybarker indicated above, the answers to your questions can be found here. In short: With a MZ-RH1, a Mac, and the Hi-MD Music Transfer software, you can only do MZ-RH1 ---> Mac transfers of Hi-MD recordings (so your old discs will not show up). You can also do Mac ---> MZ-RH1 transfers of regular MP3s (by dragging the files out of your iTunes folder into the Hi-MD Music Transfer window). Old MD devices do not record in Hi-MD mode. Hope I've got my facts straight.