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IBM 350 dual access arms

IBM 350 dual access arms

IBM 350 dual access arms
Shown here is a close-up of dual access arms used to record data on or read data from the IBM 350 disk memory unit in an IBM 305 RAMAC. The second access arm, available as an additional feature, made it possible for one access unit to be in a position for reading or writing while the other arm moved to the next storage record. As both arms could be in motion simultaneously, RAMAC processing time was substantially reduced. The disk unit for 305 systems could be obtained with storage capacities of five million digits and 10 million digits, and could be installed either singly or in pairs.