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IBM Assigned Sixteen Patents

Selective index writing prior to unthreading magnetic recording tape, calibration of high-density servo pattern detector parameters, high accuracy tape bearing surface length definition process for tape head fabrication, high resolution tape directory, stored at end of data in index partition, balanced delay and resolution for high density servo, magnetic recording head having longitudinally spaced offset arrays, variable scoping capability for physical tape layout diagnostic structure of tape, tape heads with sub-ambient pressure cavities, tape apparatus having array of write transducers each having at least three layers of coils, deleting files written on tape, restoring data, reading records from tape medium, duplexing file system data, save block data to tape in reverse order, backing up data on tape

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