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IBM 305 & 360 RAMAC. Random access memory - IBM - 1957. 
IBM, London 1957 - First Hard Drive System IBM. IBM 305 & 360 RAMAC. Random access memory accounting. 7, pp., including wrappers. Text illustrations. London: IBM United Kingdom Ltd., . Original printed self-wrappers. Fine copy. First Edition. IBMs RAMAC (Random Access Memory Accounting) was the first hard-drive system, and the IBM 305 RAMAC, introduced in September 1956, was the first commercial computer to use a moving-head hard disk drive for secondary storage of information. A RAMAC unit was also added to IBMs popular 650 computer, which had begun manufacture three years earlier. Each RAMAC unit contained 50 24-inch disks and could store five megabytes of information; it weighed over a ton and took up 1.5 square meters (16 square feet) of space. The RAMAC greatly increased the speed of data access and eliminated the need for sorting and batch processing of information, thus allowing businesses to approach "real time" accounting and administration. The present brochure reprints an article titled "Continuous data processing in business administration," which had originally appeared in the January 1957 issue of Automation Progress. The brochure was issued by the British branch of IBM. [Attributes: Soft Cover]
[Bookseller: Jeremy Norman's historyofscience]
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