Mass storage SDS Sigma series



rad cover open , disk pulled out maintenance


the primary mass storage device, known rad (random-access disk), contains 512 fixed heads , large (approx 600 mm/24 in diameter) vertically mounted disk spinning @ relatively low speeds. because of fixed head arrangement, access quite fast. capacities range 1.6 6.0 megabytes , used temporary storage. large-capacity multi-platter disks employed permanent storage.








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