The 2321 houses up to ten removable and interchangeable data cells, each containing 40 megabytes.Each data cell contains 200 strips of magnetic tape, which are the basic recording media.[3] The total storage capacity is 400 megabytes or 800 million decimal digits.Up to eight 2321s can be attached to the IBM 2841 Control Unit, allowing an overall capacity of over three GB.The Data Cell makes use of three concurrently operating separate seeking systems: a servo-hydraulic one to rotate the bins to select the proper subcell, and two solenoid driven ones: one to select the correct strip tab of the ten in the subcell, and the other to select one of the five head positions, for the 20 element head (100 tracks per strip).
IBM 2321 Data Cell at the University of Michigan Computing Center in the late 1960s
