A non-volatile includes a memory cell array for storing data, a decryption circuit for decrypting data read from the memory cell array using a prescribed computing process, and a decryption control circuit for activating the decryption circuit according to an inputted decryption command during a read operation.

 
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> Digital data storage subsystem including directory for efficiently providing formatting information for stopped records and utilization of a check value for verifying that a record is from a particular storage location
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