Semantic Units of the PREMIS Data Dictionary
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in the OWL Ontology ver. 1 is defined as:
Class Storage 
ObjectProperty hasStorageMedium
ObjectProperty hasStorage
| Containers | Current |
|---|---|
| 1 - Object 1.7 - storage | 1.7.2 storageMedium |
| Semantic unit | 1.7.2 storageMedium |
|---|---|
| Definition | The physical medium on which the object is stored (e.g., magnetic tape, hard disk, CD-ROM, DVD). |
| Applicability | Representation, Bitstream, File |
| Obligation | Optional |
| Repeatability | Not repeatable |
| Rationale | The repository needs to know the medium on which an object is stored if it is to know how and when to do media refreshment and media migration. |
| Data constraint | Value should be taken from a controlled vocabulary. Example controlled vocabularies are available at: |
| Controlled vocabulary | http://id.loc.gov/vocabulary/preservation/storageMedium.html http://metadataregistry.org/concept/list/vocabulary_id/145.html |
| Examples | Magnetic tape Hard disk TSM Magnetic tape Hard disk TSM Magnetic tape Hard disk TSM |