P

Partition

A portion of a piece of physical media. One side of a two-sided optical disk is an example of a side. Partition are referenced by PARTIDs.

Physical media

Disks and magnetic tapes are physical media. Physical media are referenced by PMIDs (physical media IDs).

PMID

Representation of a medium.

Port

An opening in a library hardware unit that is used to insert and eject media.