A library controller including a storage executes first registration processing of, in a case where registration completion information indicating registration completion in a cartridge management system is not stored in a cartridge memory provided in a cartridge, registering identification information for identifying the cartridge and the registration completion information in the cartridge memory, overwriting prohibition processing of prohibiting overwriting to the identification information and the registration completion information registered in the cartridge memory, second registration processing of registering the identification information in the storage, and execution processing of executing reading and writing of user data from and to the cartridge in a case where the identification information stored in the storage coincides with the identification information stored in the cartridge memory.

The present disclosure generally relates to using a data timestamp and/or a read counter to prevent data from being re-read and signal that the data has been accessed. The write assist element in the write head can be utilized to degrade the data or an allocated marker after the data has been read. The degradation functions as a read counter to indicate how many times the data has been read. Additionally and/or alternatively, a timestamp can be utilized. The timestamp is updated each time that the data has been accessed. In so doing, it is possible to determine whether data in a data storage device has been accessed.

Techniques for generating action recommendations for a data tape system based on a media drive calibration are disclosed. A system receives a request to perform an operation including an exchange between a data tape and a media drive. If the system determines that the operation is a data tape validation operation, the system determines whether the media drive is calibrated. If the calibration value of the media drive does not meet a threshold, the system performs a calibration procedure. The system may calibrate the media drive or replace the media drive with a calibrated media drive. The system performs the validation operation. Based on a validation result, a data tape quality value, and the media drive calibration value, the system generates a recommended action for a data tape.

The present disclosure is generally related to a tape drive comprising a tape head and a controller. The tape head comprises a first assembly and a second assembly disposed adjacent to the first assembly, each assembly comprising a write module comprising a plurality of write heads and a read module comprising a plurality of read heads. When a tape moves in a first direction, the controller is configured to control the tape head to write data to the tape using the write module of the first module and read data from the tape using the read module of the first assembly. When the tape moves in a second direction opposite the first direction, the controller is configured to control the tape head to write data to the tape using the write module of the second module and read data from the tape using the read module of the second assembly.

An information processing device selects, in a case where a plurality of pieces of data are collected and transmitted to a tape drive to be recorded on a magnetic tape, one mode of a first mode of transmitting a data group obtained by collecting the plurality of pieces of data without compression, to the tape drive, a second mode of transmitting a compressed data group in which the data group obtained by collecting the plurality of pieces of data is compressed, to the tape drive, or a third mode of transmitting a data group obtained by collecting a part of the plurality of pieces of data and remaining data, in which the part of the plurality of pieces of data is compressed and the remaining data is not compressed, to the tape drive, and transmits a data group generated in accordance with the selected mode, to the tape drive.

Regarding 100 reels of magnetic tape cartridges in the magnetic tape cartridge group, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in a predetermined environment and a servo band spacing obtained after storage in the predetermined environment for storage time T is defined as A, an arithmetic mean of a medium lives calculated by a linear function derived from a value of A and a value of the logarithm log.sub.e T of T is 4 years or longer and 3σ is 1 year or shorter. The medium life is T in a case where A satisfies Equation 1=1.5−B, and the B is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band spacings obtained in each of the five predetermined environments by ½.

The present disclosure generally relates to a tape drive including a tape head. The tape head comprises at least one same gap verify (SGV) module comprising a plurality of write transducer and read transducer pairs disposed on a substrate. Each pair comprises a null shield disposed between the write transducer and the read transducer. One or more of a position between the write transducer and the read transducer of each pair, a width, a height, a thickness, and a permeability of the null shield is adjusted to create a null region, and the read transducer is disposed in the null region. The SGV module is configured to write data to a tape using the write transducer of each pair and read verify the data written on the tape using the read transducer of each pair such that the write transducer and read transducer of each pair are concurrently operable.

An information processing device (10) includes at least one processor. The processor divides data with a certain size or larger, which is specified on the basis of a read-out history, into a plurality of pieces of partial data, and performs control to distribute and record the plurality of pieces of partial data with respect to a plurality of magnetic tapes, respectively.

The present disclosure is generally related to a tape drive including a tape head configured to read shingled data tracks on a tape. The tape head comprises a first module head assembly aligned with a second module head assembly. Both the first and second module head assemblies comprises one or more servo heads and a plurality of data heads. Each data head comprises a write head, a first read head aligned with the write head, and a second read head offset from the first read head in both a cross-track direction and a down-track direction. The first read heads and the second read heads are configured to read data from a shingled data track of the tape simultaneously. In some embodiments, the tape head is able to be dynamically tilted in order to tilt the first and second reads heads when reading curved portions of shingled data tracks.

The disclosed embodiments generally relate to a data storage device for accessing a magnetic tape. The device includes write heads writing data tracks on the magnetic tape and control circuitry configured to: (1) use the heads to write a first set of data tracks on the magnetic tape; (2) measure a distortion of the first set of data tracks after the first set of data tracks have been written; and (3) use the heads to shingle write a second set of data tracks relative to the first set of data tracks based on the measured distortion. To compensate for the distortion, a priority servo is chosen based on whether the distortion is an expansion or contraction, and/or whether the shingle writing direction is inbound or outbound. The head bar is moved during shingle writing toward the servo track associated with the priority servo.