Mark Bixby wrote:
> RTFM reveals the HPDEVCONTROL intrinsic which would seem to have the ability
to
> put the drive back online without having to eject/re-insert.  Is there some
> HP-supplied utility that will call HPDEVCONTROL, or do I have to write my
own?
 
ORBiT Software also has a program called TAPECTRL that performs
various operations, including putting the tape online. This utility
was contributed to the Interex Contributed Library. Check there for
a copy.