IBM_305 IBM_305

IBM 305 - Definition and Overview
IBM 305 at U. S. Army Red River Arsenal

The IBM RAMAC 305 was the first commercial computer that used magnetic disk storage. IBM introduced it on September 4, 1956. RAMAC stood for "Random Access Method of Accounting and Control." The 305 was one of the last vacuum tube computers that IBM built. The IBM 350 disk system stored 5 million characters. It had fifty 24-inch diameter disks. Two independent access arms moved up and down to select a disk and in and out to select a recording track, all under servo control. Several improved models were added in the 1950s. The IBM RAMAC 305 system with 350 disk storage leased for $3,200 per month. More than 1000 systems were built. Production ended in 1961 and the 305 was withdrawn in 1969.

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Example Usage of IBM
filthy_beauty: "Essa é mesa GLBT da IBM"... "Quem é o T?" "Sou eu" - MELHOR DIA, cada dia eu estou rachando mais com o povo do GR!
follow_alexis: RT @LeadershipTips: Don't be a doubter: "I think there is a world market for maybe five computers." - Thomas Watson, chairman of IBM, 1943
robeRoxanne: @annecurtissmith Sobrang nakakaaliw ang IBM DANCERS!
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