The evolution of hard disk drives

The IBM 650 magnetic drum

This 16-inch-long drum spun at 12,500 revolutions per minute to provide the IBM 650 computer of the mid-1950s with 10,000 characters of main memory. Data was magnetically encoded on 40 tracks around the drum

The RAMAC's random-access memory (RAM) consisted of a magnetic process drum that ran at 6,000 rpm.

Photo courtesy of IBM Archives.

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