No. 1 ESS ADF: Magnetic Tape Subsystem
Jerry L. Potter, F. B. Strebendt, J. R. Williams · Bell System Technical Journal · 1970
The No. 1 ESS ADF magnetic tape subsystem provides a high-volume, low-cost storage medium in which user messages are filed, and from which current message copies can be automatically retrieved upon user request. Message handling and statistical information concerning all message switching transactions are also filed on tape, providing a journal record for the switching center. Emphasis on maintenance and defensive programming techniques enables the tape subsystem to provide continuous and excellent service. This article describes the tape equipment and program package.