igabytes of digital data per cassette by using longitudinal recording. [Computer and Information Sciences] 
n., A digital object that contains all or part of the content of an electronic record, and/or metadata necessary to order, structure, or
manifest the content, and that requires specific methods for preservation of one or more electron [Archives] 
n., Physical material, such as a CD, DVD, DAT or hard disk, used for storage of digital data. [Computer and Information Sciences] 
digital entity 
n., A disc