The evolution of hard disk drives

IBM 350 Disk Storage Unit

The 350 Disk Storage System was a major component of the IBM 305 RAMAC (Random Access Method of Accounting and Control) system, which was introduced in September 1956. It consisted of 40 platters and a dual read/write head on a single arm that moved up and down the stack of magnetic disk platters. Those 40 platters stored a whopping (for the time) 5MB of data.

The RAMAC used the 350 Disk Storage Unit.

Return to Computer History Museum to highlight storage, from RAMAC to microdrives

Photo courtesy of IBM Archives.

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