P
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Partition
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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.
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Physical media
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Disks and magnetic tapes are physical media. Physical media are referenced by PMIDs (physical media IDs).
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PMID
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Representation of a medium.
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Port
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An opening in a library hardware unit that is used to insert and eject media.