aha: cannot map

[Jon Schneider <jms_(_at_)_where2_(_dot_)_co_(_dot_)_uk>]

I'd like to be able to use dump/restore for my backups because the FreeBSD
handbook says it is the best thing to use.

I performed a dump, then tried "restore -i".

I got the kernel message "aha: cannot map", then the process was locked in a
non-interruptable device wait until I downed the machine.

My hardware includes an Adaptec 1542CF and a DDS0 Archive Python and I have
been using tar under linux for years.

What could be wrong ?

        Jon