Checkout is when the volume will no longer be managed by the automated
library, ie, volumes going offsite.  If ADSM wants that volume, its mount
request fails.

move media is used to move media to an overflow location, ie, the "tape
room" because you don't have enough room in your library to contain all of
your primary pool volumes.  moved media is different than checked out media
in that ADSM can still ask for moved media to be mounted.  If ADSM wants one
of these volumes, it creates a mount request that shows up on the console
your operators are running to satisfy overflow mount requests.  See the
"query request" command.

Alex Paschal
Storage Administrator
Freightliner, LLC
(503) 745-6850 phone/vmail