> 
> Except for the fact that my installation is rather old by now, and I
> just finished FTPing the more recent one.  I'd like to put it on tape,
> but I can't seem to write to my TK70...  It just has IO errors, and the
> kernel eventually panics.
> 
It should work on TK70 also, but there may be some troubles. It can 
be a good idea to first write something on the tape from scratch
with the right density. Then be sure making mt -f /dev/rmt8 rewind
before trying to write the boot blocks. I don't know why this is
necessary, but it worked for me.
Also be sure that you are using a cassette of type "CompacTape II"
otherwise it definitely won't work. TK70 can't write TK50 tapes.

-- Ragge