Fujifilm Corporation

Yusuke Kaneko

Norihito Kasada

Yuto Murata

Toru Nakao

Atsushi Musha

Yasushi Komori

Tadashi Kira

Junichi Nakamigawa

In the magnetic tape, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in an environment of a temperature of 32° C. and relative humidity of 55% and a servo band spacing obtained after storage in the environment for a storage time T is set to A, and T is defined as 24 hours, 48 hours, 72 hours, 96 hours, or 120 hours, a medium life calculated by a linear function of A and a logarithm logT of T, that are derived from a value of A and a value of the logarithm logT of T obtained for each T is 3 years or longer. The medium life is T in a case where the A satisfies Equation 1: A=1.5−B.

Magnetic tape cartridge and magnetic recording and reproducing device

In the magnetic tape, a magnetic tape deformation amount after storage for 3 months each in a predetermined environment is 0.50 μm or less, a rate of a change in the magnetic tape deformation amount with respect to a change in relative humidity is 0.0001 μm/% to 0.0500 μm/%, and a rate of a change in magnetic tape deformation amount with respect to a change in temperature is 0.0010 μm/° C. to 0.1000 μm/° C.

A magnetic tape cartridge includes a case in which a magnetic tape is housed, and an NVM of a cartridge memory provided in the case. The NVM stores cartridge information including an identification ID regarding an allowable range of temperature/humidity in using the magnetic tape, an upper limit of a preservation period of the magnetic tape, and an upper limit of a use frequency of the magnetic tape.

Magnetic tape cartridge, magnetic tape drive, magnetic tape system, and method of operating magnetic tape drive

In the magnetic tape, a maximum value of magnetic tape deformation amounts after storage in each of five environments for 1 year is 0.50 μm or less, a rate of a change of magnetic tape deformation amount with respect to a change in relative humidity obtained from the five magnetic tape deformation amounts is 0.0001 μm/% to 0.0500 μm/%, and a rate of a change of the magnetic tape deformation amount with respect to a change in temperature obtained from the five magnetic tape deformation amounts is 0.0010 μm/° C. to 0.1000 μm/° C.

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

Magnetic tape cartridge group and magnetic recording and reproducing device

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 logT of T is 4 years or longer and 3&#x3c3; is 1 year or shorter. The medium life is T in a case where A satisfies Equation 1=1.5&#x2212;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 &#xbd;.

A magnetic tape cartridge includes a case that accommodates a magnetic tape on which a plurality of servo bands and a plurality of data bands are formed, servo patterns being recorded in the servo bands, and a memory provided in the case. The memory stores servo pattern interval-related information related to a servo pattern interval determined for each of the plurality of data bands included in the magnetic tape. The servo pattern interval is commonly used for a plurality of division areas obtained by dividing the data band in a width direction of the magnetic tape, and is a representative interval between a first servo pattern and a second servo pattern.

Magnetic tape cartridge, information acquisition method, and program

The magnetic tape cartridge includes a magnetic tape that is accommodated in the magnetic tape cartridge while being wound around a reel hub. A water absorption amount of the magnetic tape measured after the magnetic tape cartridge is stored in a storage environment of a temperature of 32&#xb0; C. and a relative humidity of 80% for 10 days is 0.30 g or less as a value in terms of a length of the magnetic tape of 1000 m, and the water absorption amount is a value measured in a measurement environment with a temperature of 21&#xb0; C. and a relative humidity of 50% within 1 hour after the storage.

Magnetic tape cartridge and magnetic tape apparatus

The magnetic tape cartridge includes a magnetic tape that is accommodated in the magnetic tape cartridge while being wound around a reel hub. A water absorption amount of the magnetic tape measured after the magnetic tape cartridge is stored in a storage environment of a temperature of 32&#xb0; C. and a relative humidity of 80% for 10 days is more than 0.30 g as a value in terms of a length of the magnetic tape of 1000 m, and the water absorption amount is a value measured in a measurement environment with a temperature of 21&#xb0; C. and a relative humidity of 50% within 1 hour after the storage.

A magnetic tape in which a minimum value of TDStens among five TDStens measured respectively at a temperature of 16&#xb0; C. and a relative humidity of 20%, a temperature of 16&#xb0; C. and a relative humidity of 80%, a temperature of 26&#xb0; C. and a relative humidity of 80%, a temperature of 32&#xb0; C. and a relative humidity of 20% and a temperature of 32&#xb0; C. and a relative humidity of 55% is 1.43 &#x3bc;m/N or more, a ratio of a change of TDStens to a change of a relative humidity obtained from the five TDStens is 0.005 &#x3bc;m/N/% or less, and a ratio of a change of TDStens to a change of a temperature obtained from the five TDStens is 0.020 &#x3bc;m/N/&#xb0; C. or less.

Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus

The magnetic tape satisfies TDSage+TDSenv&#x2212;TC&#x2264;0.30 &#x3bc;m. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by &#xbd;, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.

Magnetic tape having controlled dimensions, magnetic tape cartridge, and magnetic tape apparatus

A magnetic tape device, a magnetic tape, and a magnetic tape cartridge, in which the magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, the magnetic tape after running in a state where the tension is applied is wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction, and a center line average roughness Ra measured regarding a surface of a back coating layer of the magnetic tape with an atomic force microscope is in a range of 5 to 13 nm.

Magnetic tape device, magnetic tape, and magnetic tape cartridge

In the probability distribution calculated from TDSage, TDSenv, and TC, the magnetic tape has the probability Pof equal to or less than 0.2%, in which the absolute value of &#x394;SB exceeds 0.3 &#x3bc;m. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by &#xbd;, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.

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Minami-ashigara, Japan

Yusuke Kaneko