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IBM 3390 direct access storage device

IBM 3390 direct access storage device

IBM 3390 direct access storage device
There were enough data in IBM's new 3390 Direct Access Storage Device (foreground) in 1989 to keep 35 typists typing 100 words per minute, eight hours a day, for a century. Only one-third the size of IBM's then current DASD -- the 3380K (background) -- the 3390 could store 22.7 billion bytes or three times the capacity of the 3380K.