3.1.5 Extent and medium
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Purpose – To identify and describe a) the physical or logical extent and b) the medium of the unit of description
Rules: Record the extent of the unit of description by giving the number of physical or logical units in Arabic numerals and the unit of measurement. Give the specific medium (media) of the unit of description. Alternatively, give the linear shelf space or cubic storage space of the unit of description. If the statement of extent for a unit of description is given in linear terms and additional information is desirable, add the additional information in parentheses.
The relationship between physical or logical units is not at all straightforward with born digital material, and the question of medium is similarly complex. This complexity is probably better dealt with elsewhere (e.g. see notes under 3.4.4 Physical characteristics and technical requirements). Users may or may not be interested in this complexity, but for the sake of consistency this field should only be used to present a simple (and human common-sense) view of extent and medium such that a user will be able to get a sense of the size and sort of stuff they would be dealing with if they were to ‘order’ the unit of description up (in the access version if that is different from the preservation version), e.g. something like 10,321 files; 14.6GB or 1 digital file.