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

摘要: A digital data storage system in the form of a mass subsystem which information is stored on one or more disk units, with element constituting track device and each storing plurality records. Each associated descriptor. When control retrieves contents record, it can process to generate check value compare generated for record as descriptor track. If they appropriately, determine that was retrieved was, fact, be retrieved. On other hand, if do not proper record. are updated, update reflect