to write
tar cvBf - stickman | rsh blarney dd of=/dev/nrst0 bs=20b

to read
rsh blarney dd if=/dev/nrst0 bs=20b | tar xvBf -

to rewind
rsh blarney mt -f /dev/nrst0 rewind

forward an EOF
rsh blarney mt -f /dev/nrst0 fsf

back an EOF
rsh blarney mt -f /dev/nrst0 bsf

can add a count after above two commands