by Dave Rice and Stefan Elnabli – October 28, 2010
Due to the susceptibility and challenges of both digital and analog carriers, data must be periodically moved from one carrier to another within a preservation process. When analog data is migrated from its original carrier to a new digital carrier, the analog data is ultimately transformed through the process of sampling. Challenges are then posed to authenticating the accuracy of such a migration. Despite the perceptual exactness of an analog source to its digital copy, the analog data and the digital data are never exactly the same. However, in the realm of file-based digital-to-digital migration, exactness can be achieved and evaluated. Within the entirely file-based environment, checksums and data comparison tools can verify that two copies are exact matches or reveal their deviation in a way that is not feasible between analog and digital environments.