For what it's worth: I have tried repeatedly to use some FujiFilm DC2120
(QIC-80 formatted) tapes in the Jumbo-250 Tape Drive (installed in a
Gateway-200 tower), and neither FBSD nor GWY-2000 DOS Tape program will
accept these tapes.
No problem with Verbatim DC2120 tapes (also QIC-80 format)? Oh well.