Apple 40Meg Tape Drive for AUX

[root]

I recently purchased an Apple 40SC tape drive.  Electronically everything is
fine.  I have loaded the tape drive device driver into the kernel with the
following commands :
			/etc/newunix tc
			/etc/autoconfig -v -S /etc/startup

and performed a mknod /dev/rmt/tc1 b 9 0 and mknod /dev/rmt/tc1n b 9 0 to
create the appropriate special files (tape is on SCSI id 1).

The problem is that : (1) I guessed at the minor number, though I thought 0
seems reasonable and (2) tar, cpio etc can not open the device.

I also set the owner and group on the special files to bin.

Can someone shed some light on my problem and how 
does one go about formatting the tapes (diskformat does not seem to be
the right utility).

Thanks,

Bob