mjmahon@aol.com (Michael J. Mahon) writes: > I expect that the Power Mac controller does not provide the variable speed > control voltage that the Superdrive floppy needs. When you format a > ProDOS (800K) disk, do you hear the drive changing speeds? The Superdrive/FDHD does its own speed control. The controller in recent Macs isn't capable of GCR.