The first random-access digital storage device was the Williams tube, which was based mostly on a normal cathode ray tube. However, the knowledge stored in it and delay-line reminiscence was risky in the reality that it had to be repeatedly refreshed, and thus was lost as quickly as power was eliminated. The earliest type of non-volatile laptop storage was the magnetic drum, invented in 1932 and used in the Ferranti Mark 1, the world’s first commercially obtainable general-purpose electronic laptop.

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