186results about "Track finding/aligning" patented technology

A plurality of servo patterns are recorded in a magnetic tape along a longitudinal direction. The servo pattern is at least one linear magnetization region pair. The linear magnetization region pair includes a first linear magnetization region, which is linearly magnetized, and a second linear magnetization region, which is linearly magnetized. The first linear magnetization region and the second linear magnetization region are inclined in opposite directions with respect to a first imaginary straight line along a width direction of the magnetic tape. The first linear magnetization region has a steeper inclined angle with respect to the first imaginary straight line than the second linear magnetization region.

A first servo pattern has a first position and a second position which intersect an imaginary line. A second servo pattern has a third position intersecting the imaginary line. The imaginary line is set at a position at which a relationship in which a distance between the first position and the second position is half of a distance between the first position and the third position is established between the first servo pattern and the second servo pattern adjacent to each other in a longitudinal direction. A width of a servo band is set to a length in which a distance from the imaginary line to one end of the servo band in a width direction and a distance from the imaginary line to the other end of the servo band in the width direction are equal.

The magnetic head comprises a recording module in which a plurality of recording elements are provided, and a reproducing module in which a plurality of reproducing elements are provided. The recording module and the reproducing module are disposed along a longitudinal direction of the magnetic tape. A pair of first servo reading elements of the recording module and a pair of second servo reading elements of the reproducing module are shifted from each other by a predetermined difference along one direction in the width direction of the magnetic tape. The predetermined difference is defined based on a pitch between a plurality of tracks formed using an SMR method and a length of the recording element in the width direction of the magnetic tape.

Provided is a magnetic tape having a non-magnetic support and a magnetic layer containing a ferromagnetic powder, wherein the protrusion height Spk defined in ISO 25178 is 1.2 to 2.8 nm inclusive, said protrusion height Spk being measured in a measurement region of 5 × 5 μm on the surface of the magnetic layer after 500 cycles of back and forth sliding with respect to an LTO8 head at a head inclination angle of 15° at a temperature of 15°C and a relative humidity of 80%.

Provided is a magnetic tape apparatus. In a case where a maximum value of an absolute value of a difference between a servo band interval obtained before the following storage and a servo band interval obtained after the storage of N cycles, in which a predetermined storage is set as one cycle, is denoted by A, and a medium life is equal to or longer than 5 years, which is calculated by a linear function of A and a logarithm loge T of T derived from a value of A and a value of the logarithm loge T of a total storage time T of the storage of the N cycles, each of which is obtained by setting N as 1, 2, 3, 4, or 5. The medium life is T, in a case where A satisfies Expression a: A=1.5−B+C.

A servo reproduction apparatus according to the present technology includes: a servo reproduction head. The servo reproduction head includes a first reproduction head portion and a second reproduction head portion. The first reproduction head portion reads a servo pattern recorded on a plurality of first servo bands, which are some of a plurality of servo bands in a magnetic tape including the plurality of servo bands. The second reproduction head portion reads a servo pattern recorded on a plurality of second servo bands, which are others of the plurality of servo bands.

This magnetic tape drive is used in a magnetic tape cartridge which is equipped with a magnetic tape and a storage medium. The storage medium stores geometric characteristic information. The magnetic tape records geometric characteristic information. The processor of the magnetic tape drive leaves second geometric characteristic information on the storage medium by deleting the first geometric characteristic information from the storage medium. The second geometric characteristic information is information for which it is possible to identify the recording position at which the geometric characteristic information is recorded on the magnetic tape. The first geometric characteristic information is information other than the second geometric characteristic information.

To accurately detect read errors in postcodes. [Solution] The magnetic disk device of the embodiment comprises a magnetic disk having a plurality of tracks, a magnetic head for reading and writing data to the magnetic disk, a plurality of servo regions provided on each of the plurality of tracks and including at least a portion of a first physical pattern which is the physical pattern after writing of a first data pattern including position information for each of the plurality of tracks, and a control unit for controlling the magnetic head. Each of the plurality of servo regions includes either a first servo region including the first physical pattern, or a second servo region including a second physical pattern which is the physical pattern after writing of a second data pattern different from the first data pattern, for each of the plurality of tracks, and the control unit determines whether the third servo region among the plurality of servo regions of the plurality of tracks has the first or the second physical pattern.

To enable data to be satisfactorily recorded and / or reproduced when the data is recorded and / or reproduced while changing a head tilt angle during running of a magnetic tape after storing the magnetic tape.SOLUTION: A magnetic tape device is provided. An angle θ formed by the axis of the element array of a magnetic head with respect to the width direction of the magnetic tape is changed during running of the magnetic tape in the magnetic tape device. When 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 environment for a storage time T is defined as A and T is set to be a plurality of predetermined times, a medium life calculated by a linear function of A and a logarithm loge T of T, that are derived from a value of A and a value of the logarithm loge T of T obtained for each T is 5 years or longer. The medium life is T when A satisfies a prescribed formula.SELECTED DRAWING: None

To provide a magnetic recording device that can improve productivity and a manufacturing method thereof.SOLUTION: According to the embodiment, a magnetic recording device includes a magnetic recording medium, a magnetic head, and a control unit. The magnetic head includes a coil, a first magnetic pole, and a light-emission unit. The control unit performs a first operation and a second operation. In the first operation, the control unit records first servo position information to a first area of the magnetic recording medium. In the second operation, the control unit executes a repair operation when a first condition is not fulfilled. The first condition includes that the recording condition of the first servo position information is within a first range. In the repair operation, the control unit performs an erase operation for irradiating light from the light-emission unit to the first area, and performs a re-record operation for recording the first servo position information to the first area after the erase operation again.SELECTED DRAWING: Figure 1

To achieve accuracy improvement of an operation result state of a control target to a target state.SOLUTION: A learning controller includes a feedback control part 30 and a learning control part 40. The feedback control part 30 outputs a feedback signal for making an operation result state track a target state of a control target 34 operating according to an input control signal according to a feedback signal based on an input signal according to an error in the tracking between the operation result state and the target state. The learning control part 40 outputs, to a feedback route F for an input signal according to the tracking error to be inputted into the feedback control part 30, learning control input which has been updated according to the tracking error and is provided for bringing the tracking error closer to zero. An evaluation interval length of an evaluation interval of the tracking error made by the learning control part 40 is longer than an output interval length of an output interval of output of the learning control input to the feedback route F by the learning control part 40.SELECTED DRAWING: Figure 2

An indicator indicating a non-linearity of a servo pattern is within 15% or less of a track pitch. The track pitch is a pitch between tracks. The indicator indicates a degree of variation in the plurality of distance differences from an average value of the plurality of distance differences. The distance difference is a difference between a distance between a pair of first positions corresponding to each other in the width direction in the pair of servo patterns and a distance between a pair of second positions deviated from the pair of first positions in the width direction by a first predetermined interval in the pair of servo patterns. The plurality of distance differences are obtained by measuring the distance difference for each second predetermined interval along the width direction in the pair of servo patterns. The first predetermined interval is larger than the second predetermined interval.

To provide a suspension capable of suppressing interference between a disk and a slider.SOLUTION: The suspension 10 is provided with a load beam 20 having a dimple part 50 and a flexure 21 having a slider mounting part 30. The convex surface 51 of the dimple portion 50 contacts the slider mounting portion 30. The curvature radius R of the convex surface 51 is less than 0. 10mm, and the gain defined by the following equation is 0.9 or more. Where a is the input amplitude, A is the amplitude, R is the radius of curvature of the convex surface 51, and Fpr is the flexure pitching resistance. k1 is the pitching rigidity of the air bearing, and k2 is the pitching rigidity of the slider mounting portion 30.SELECTED DRAWING: Figure 9

The servo pattern recording method according to one aspect of the present technology involves recording a servo pattern in a plurality of servo bands that are arranged at intervals in the width direction of a magnetic layer in a magnetic tape, the method including: causing the magnetic tape to travel with a prescribed tension; and recording a servo pattern in the plurality of servo bands at a second pitch narrower than a first pitch, which is the positioning interval of two servo lead heads in a tape drive device that records data in the magnetic layer or that plays back data recorded in the magnetic layer.

To provide a magnet tape which may contribute to operational stability improvement of a drive during recording and / or reproduction after prolonged storage.SOLUTION: A magnetic tape comprising a non-magnetic support body and a magnetic layer containing ferromagnetic powder, a magnetic tape cartridge comprising the magnetic tape, and a magnetic tape device are provided. The number of recesses with circle-equivalent diameters of 0.15 to 0.25 μm, inclusive, present on a surface of the magnetic layer is 100 to 2500, inclusive, per 40 μm×40 μm area. A standard deviation σ of the number of recesses in a width direction of the surface of the magnetic layer is 100 or less.SELECTED DRAWING: None

To provide a magnetic tape that can exhibit excellent electromagnetic conversion characteristics, and is excellent in running stability in recording and / or playing back data at different head inclination angles in a high temperature and high humidity environment.SOLUTION: There is provided a magnetic tape in which a vertical direction switching field distribution SFD of the magnetic tape is 1.5 or less, in an environment of a temperature of 32°C and relative humidity of 80%, frictional force F45° on a surface of a magnetic layer with respect to an LTO8 head measured at a head inclination angle of 45° is 4 gf or more and 15 gf or less, and a standard deviation of the frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at head inclination angles of 0°, 15°, 30°, and 45° is 10 gf or less. Also there are provided a magnetic tape cartridge including the magnetic tape, and a magnetic tape device including the magnetic tape.SELECTED DRAWING: None

To provide a magnetic tape that is excellent in running stability in recording and / or playing back data at different head inclination angles in a high temperature and high humidity environment.SOLUTION: There is provided a magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 μm or less, in an environment of a temperature of 32°C and relative humidity of 80%, frictional force F45° on a surface of a magnetic layer with respect to an LTO8 head measured at a head inclination angle of 45° is 4 gf or more and 15 gf or less, and a standard deviation of the frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at head inclination angles of 0°, 15°, 30°, and 45° is 10 gf or less. Also there are provided a magnetic tape cartridge including the magnetic tape, and a magnetic tape device including the magnetic tape.SELECTED DRAWING: None

To provide a magnetic disk device that can measure PPO correction values with high efficiency.SOLUTION: A plurality of first positions are set in a radial direction of a magnetic disk. The plurality of first positions includes a plurality of second positions and a third position different from the plurality of second positions. A controller of the magnetic disk device measures a RRO (Repeatable RunOut) correction value for each of the plurality of second positions, and executes a first step in which a RRO correction value is not measured for the third position. After the first step, the controller executes a second step in which write or read access is performed on a plurality of tracks. The second step includes acquiring a position error signal by a read head during access and calculating the RRO correction value for the third position based on the position error signal.SELECTED DRAWING: Figure 5

To provide a magnetic tape cartridge, a magnetic tape drive, a method of detecting servo patterns, and a program for obtaining a highly reliable servo signal.SOLUTION: In a magnetic tape drive 14, a magnetic tape cartridge 12 includes a magnetic tape MT on which a plurality of servo patterns 58 are recorded in a longitudinal direction and a cartridge memory 24, which is an example of a storage medium. The storage medium stores servo format information SF including servo pattern inclination information SF1 which is information relating to the inclination of the servo pattern with respect to a first virtual straight line.SELECTED DRAWING: Figure 14

A hard disk drive includes multiple disk media mounted on a spindle, where the outer diameter of each disk medium is offset from the inner diameter of the disk medium in a same direction along an axis of rotation of the spindle, and a load / unload ramp positioned, based on the offset, to align in correspondence with the outer diameters of the disk media. Thus, the curvature of irregular disk media, such as that associated with thinner and thinner disks, is mitigated by grouping similarly-characterized irregular disks together on a given spindle and compensating the ramp accordingly.

The present invention provides a magnetic disk device that can improve the recording density of data on the disk and suppress the degradation of write performance. [Solution] During the first write period, if the determination unit 67 determines that the error correction of the first user data on the first data track has not exceeded the limit, it instructs the write processing unit 62 to continue the write process and the management unit 65 to perform the second management. If the determination unit 67 determines that the above error correction has exceeded the limit, it instructs the write processing unit 62 to continue the write process and the management unit 65 to perform the third management. During or after the first write period, the determination unit 67 instructs the management unit 65 to perform the process of saving the data belonging to the third group to a non-volatile recording medium.

To provide a magnetic tape that is excellent in running stability in recording and / or playing back data at different head inclination angles in a high temperature and high humidity environment.SOLUTION: There is provided a magnetic tape in which C-H-derived C density is 45 atom% or more and 65 atom% or less and is calculated from a C-H peak area ratio in a C1s spectrum obtained through X-ray photoelectron spectroscopic analysis performed at a photoelectron take-out angle of 10 degrees on a surface of a magnetic layer, in an environment of a temperature of 32°C and relative humidity of 80%, frictional force F45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head inclination angle of 45° is 4 gf or more and 15 gf or less, and a standard deviation of the frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at head inclination angles of 0°, 15°, 30°, and 45° is 10 gf or less. Also there are provided a magnetic tape cartridge including the magnetic tape, and a magnetic tape device including the magnetic tape.SELECTED DRAWING: None

To provide a magnetic tape having excellent running stability upon data recording and / or playback at different head inclination angles in high-temperature and low-humidity environment.SOLUTION: Provided are: a magnetic tape having a non-magnetic support body and a magnetic layer containing a ferromagnetic powder, in which an arithmetic mean roughness Ra (called an edge part Ra) is 1.50 nm as measured at an edge part on the surface of the magnetic layer, an arithmetic mean roughness Ra (called a central part Ra) is equal to or greater than 0.30 nm and equal to or less than 1.30 nm as measured at the central part on the surface of the magnetic layer, and the Ra ratio (between the central part Ra and the edge part Ra) is equal to or greater than 0.75 and equal to or less than 0.95; a magnetic tape cartridge including the magnetic tape; and a magnetic tape device including the magnetic tape.SELECTED DRAWING: None

To provide a detection device, an inspection device, a magnetic tape drive, a magnetic tape system, a detection method, an inspection method, and a program capable of accurately detecting a servo pattern signal even if there are variations in geometric characteristics of a servo pattern.SOLUTION: A detection device includes a processing device and a storage medium. The storage medium stores an ideal waveform signal in advance representing an ideal waveform of a servo pattern signal resulting from reading of the servo pattern recorded on a servo band of a magnetic tape by a servo reading element. The processing device obtains the servo band signal resulting from reading of the servo band by the servo reading element and detects the servo pattern signal by comparing the servo band signal and the ideal waveform signal.SELECTED DRAWING: Figure 10

To provide a suspension capable of arranging a slider on a slider arrangement portion in a stable posture.SOLUTION: A flexure 22 of a suspension 1 includes a metal base 40, a circuit portion 41, and a slider arrangement portion 50. The slider arrangement portion 50 has an aperture portion 70 formed in the metal base 40 and a slider support portion 90 provided on the metal base 40. The aperture portion 70 is formed at a position where the slider 51 is arranged. An embedding circuit portion 41a is arranged inside the aperture portion 70. The embedding circuit portion 41a is a part of a length direction of the circuit portion 41. The slider support portion 90 supports the slider 51 in a state where the embedding circuit portion 41a is arranged in the aperture portion 70. The embedding circuit portion 41a has an abutting portion 91 contacting a protrusion portion 30a of a load beam 21.SELECTED DRAWING: Figure 4

[Problem] To further reduce friction between a servo write head and magnetic tape, and enable more accurate writing of a servo pattern via a servo write head. [Solution] A servo write head according to the present technology includes a plurality of first regions, a plurality of second regions, and a plurality of third regions. The plurality of first regions each include a servo element for writing a servo pattern on the magnetic tape, and are arranged at predetermined intervals along a first direction. The plurality of second regions each include a plurality of first groove portions that have a first groove width and are cut along a second direction that is a direction intersecting the first direction, and are alternately arranged with the first regions in the first direction. The plurality of third regions each include a second groove portion, at least some of which have a second groove width wider than the first groove width and which are cut along the second direction, and the third regions correspond to regions between the first regions and the second regions.

A magnetic tape drive is used for a magnetic tape cartridge including a magnetic tape and a storage medium. Geometrical characteristic information is stored in the storage medium. The geometrical characteristic information is recorded on the magnetic tape. A processor of a magnetic tape drive erases first geometrical characteristic information from the storage medium to leave second geometrical characteristic information in the storage medium. The second geometrical characteristic information is geometrical characteristic information capable of specifying a recording position in the magnetic tape at which the geometrical characteristic information is recorded. The first geometrical characteristic information is geometrical characteristic information other than the second geometrical characteristic information.

To provide a magnetic tape that suppresses a large reduction in electromagnetic conversion characteristics in recording and / or playing back data at different head inclination angles.SOLUTION: There is provided a magnetic tape in which a tape thickness of the magnetic tape is 5.2 μm or less, in an environment of a temperature of 23°C and relative humidity of 50%, the AlFeSil wear value 45° on the surface of the magnetic layer measured at an inclination angle of an AlFeSil rectangular column of 45° is 20 μm or more and 50 μm or less, a standard deviation of the AlFeSil wear values on the surface of the magnetic layer measured at inclination angles of the AlFeSil rectangular column of 0°, 15°, 30°, and 45° is 30 μm or less, and the inclination angle of the AlFeSil rectangular column is the angle formed by a longitudinal direction of the AlFeSil rectangular column and a width direction of the magnetic tape. Also there are provided a magnetic tape cartridge including the magnetic tape, and a magnetic tape device including the magnetic tape.SELECTED DRAWING: None