Ok. Assuming you are using the scripts from the wiki site, they are wrong O_o
Change the dd in dtdist.sh so it says:
[color=0000ff]dd if=$name of=/dev/rmt/4hn bs=32k[/color]
4n is 120MB mode. That works for every release of AMIX
except 2.1, because 2.1 is huge and needs a 150MB tape.
I am seeing conflicting reports on Usenet as to whether the "32k" is good or bad. Apparently it is the blocksize used on the original 2.1 tape.
Second thing, to zero out anything (tape, disk, or to make a big empty file) use /dev/zero:
[color=0000ff]dd if=/dev/zero of=/dev/rmt/4hn[/color]
I got my cleaning tape from
these guys. Part number 343032, cheapest I could find it.
Better luck now that you can fix the script :-)