s or grooves that are cut and read by a laser beam. Its logical format specifications are governed by the Universal Disk Format (UDF) specification.S yn.: digital versatile disc. [Computer and Information Sciences] 
n., Data appended to a unit of data held on a computer, or a cryptographic transformation of a data unit, that allows the recipient
n., The discipline which studies the genesis, forms and transmission of archival documents, and their relationship with the facts represented in them and with their