IBM 1311-2 Disk Drive Unit (1963)
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The IBM 1311 disk drive units were introduced in 1963 and had a 50 track per inch (TPI) storage density.
The model pictured was once used with the
IBM 1401 CPU.History of Computing
An Encyclopedia of the People and Machines that Made Computer History
Copyright © 1982-2000, Lexikon Services "History of Computing" ISBN 0-944601-78-2