I've dug out an old Adic tape drive and thought at first that it used standard DC-300 or DC-600 cartridges. But every time I put a cart in the unit, the tape would spin for a couple of seconds and then the error light and alarm would come on. Poking inside the cabinet, it's very obvious that the DC-600 type of cartridge has the correct form factor, but that this unit doesn not employ optical sensing of BOT/EOT, etc. There are no optical sensors at all. I'm not certain, but I don't even think a conductive foil sensor is used either. It appears that the tape must be preformatted with some sort of prerecorded pattern to identify the beginning of tape. Anyone have any idea of what kind of tape this thing takes? Cheers, Chuck