A physical portion of media that is addressed to a logical unit of storage. Sides of an optical disk or a tape are examples of partitions. Partitions are referenced by part IDs. Also referred to as side.
Physical media
Media referenced by PMIDs (physical media identifiers). Disks and magnetic tapes are examples of physical media.
PMID
Physical media identifier. Representation of media.
Port
An opening in a library hardware unit that is used to insert and eject media.