After installing an SCSI tape using mkdev tape,, issuing tape command returns ...no such device error. If I try to remove unit 0, using mkdev tape, response is invalid choice, please enter a number between 0 and -1. If I try to install, response is (of course), another device is installed at this address. SCO OpenServer 5.0.6 on HP NetServer tc2110 using embedded controller (Adaptec 160). Driver is ad160. Any clues appreciated.