[This is preliminary documentation and subject to change.]
There are four types of media pools in RSM:
Media that is new or unrecognized
Media that have labels that are recognized by the system but are not in the RSM catalog
Media available for writing
Media used by a particular application on the system
All media in an application media pool are in the RSM catalog by default. Media in the available state can reside in both the scratch media pools and application pools. Note that there are individual Import, Foreign, and Scratch media pools for each media type detected on the system.
Media in Scratch, Import, or Foreign media pools are deleted from the RSM catalog when they are ejected from the library or drive.