IBM RAMAC 305 (1956)
The IBM Random Access memory machine was announced in 1956. It was marketed as a business machine for accounting applications. The RAMAC used a disc storage unit (shown along back wall) capable of holding 5,000,000 units. It consisted of 50 magnetic metal disks arranged in a vertical stack, accessed by a read-write arm for high speed random access, online.
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
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