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Magnetic drum is a storage medium using __________

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Magnetic drum is a storage medium using __________

(a) The surface of a jumping magnetic drum

(b) The surface of a rotating magnetic drum

(c) The surface of a stopped magnetic drum

(d) The surface of a moving magnetic drum

This question was addressed to me in a job interview.

My question comes from Introduction of Memory Devices topic in division Memory Devices of Digital Circuits

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The correct choice is (b) The surface of a rotating magnetic drum

Explanation: Magnetic drum is a storage medium using the surface of a rotating magnetic drum which have tendency to hold the data.

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