RM03 volume valid bit?

[Jeffrey W Percival]

We have an RM03 we use for removable disk packs (i.e., it's
not our system disk).  We are running 2.8BSD on a PDP 11/70.
We find that after spinning down a pack and putting in a new
one, we can't access the disk without re-booting.  We get
messages like "I/O error".  What happens on reboot to clear
whatever the disk driver is complaining about?  Can it be
done without rebooting?

-- 
	Jeff Percival ...!uwvax!uwmacc!jwp