FIELD: computer engineering. SUBSTANCE: disk record medium 1 is, essentially, control signal carrying disk. Control signal includes data on diameter. Data writing and/or reading device has drive mechanism 2 designed to set disk record medium 1 in rotary motion. Device also has control unit 5 that functions to vary gain of control circuit 2, 3, 7, 8, 89 for controlling rpm of data medium 1 in response to control signal entered in record medium. EFFECT: ability of using media of different diameters upon coordinating diameter of writing/reading device with that of record medium. 6 cl, 2 dwg
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