274results about "Track finding/aligning" patented technology

To provide a data storage device comprising a processing device, and a method.SOLUTION: Provided is a method implemented or performed when a read / write channel circuit of a control circuit of a disk drive controls operation of the disk drive. The method includes selecting a seek time model from a plurality of seek time models at least partially based on operation characteristics of an access command. The operation characteristics is related to the off-track sensitivity of executing the access command. The method also uses the selected seek time model to determine the access time for the access command and selects the next access command for execution based on the determined access time for the access command and the determined access time for the other access command among the plurality of access commands.SELECTED DRAWING: Figure 2C

To provide a magnetic tape which can contribute to increase of the operation stability of a drive in recording and / or reproduction after a long-time storage.SOLUTION: The magnetic tape has a non-magnetic supporting body and a magnetic layer including ferromagnetic powders. The present invention also provides a magnetic tape cartridge and a magnetic tape device including the magnetic tape. The height Spk of a protruding mounting part defined by ISO 25178 in the surface of the magnetic layer is at least 1.5nm and is 3.0nm at largest. The standard deviation σ of the Spk in the width direction of the surface of the magnetic layer is 0.5 nm at largest.SELECTED DRAWING: None

A servo pattern recording apparatus according to an embodiment of the present technology is an apparatus that records a plurality of servo patterns adjacent to each other in a tape width direction on a magnetic layer of a magnetic tape, including: a servo write head; and a temperature adjustment unit. The servo write head includes a plurality of recording units arranged corresponding to a plurality of servo bands of the magnetic layer on which the plurality of servo patterns is recorded. The temperature adjustment unit is configured to be capable of individually adjusting temperatures of the plurality of recording units.

A system for determining a fly height includes a first head of a disk drive, a second head of the disk drive, a capacitive sensor circuit coupled to the first head and the second head, and a logic device coupled to the capacitive sensor circuit. The capacitive sensor circuit is configured to measure a first capacitance between the first head and the first disk, remove noise from the first capacitance using a second capacitance between the second head and the second disk, and based thereon determine a corrected first capacitance. The logic device is configured to determine the fly height between the first head and the first disk using the corrected first capacitance.

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.

Provided is a magnetic recording medium that is capable of achieving favorable electromagnetic conversion characteristics and suppressing the increase in friction.A magnetic recording medium is a tape-shaped magnetic recording medium and includes: a base; and a magnetic layer. An average thickness of the magnetic recording medium is 5.30 μm or less. The magnetic layer contains a chlorine atom and a nitrogen atom, an atomic concentration ratio (A2 / A1) of a maximum chlorine atomic concentration A1 obtained by measuring a chlorine atomic concentration of the magnetic layer in a thickness direction of the magnetic layer and a maximum nitrogen atomic concentration A2 obtained by measuring a nitrogen atomic concentration of the magnetic layer in the thickness direction of the magnetic layer is 0.50 or more and 0.75 or less. An average value of a protruding peak height Rpk of a surface of the magnetic layer is 2.10 nm or less.

A servo pattern recording head includes: a plurality of head cores that are magnetically separated from each other; and a plurality of gap patterns that are formed on a front surface of each of the plurality of head cores and that are used for recording a plurality of servo patterns in a width direction of a magnetic tape by applying a magnetic field to the magnetic tape in response to a pulse current, in which the plurality of gap patterns are formed on the front surface along a direction corresponding to the width direction, and the plurality of gap patterns deviate from each other at a predetermined interval in a direction corresponding to a longitudinal direction of the magnetic tape between the gap patterns adjacent to each other along the direction corresponding to the width direction.

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.

[Object] To provide a technology for writing a servo pattern that can be accurately read even when a data write head is disposed so as to be inclined with respect to a width direction of a magnetic tape, and the like.[Solving Means] A servo recording apparatus according to the present technology includes: a servo write head. The servo write head writes a first servo pattern and a second servo pattern to a plurality of servo bands of a magnetic tape, the first servo pattern and the second servo pattern being asymmetric with respect to a width direction of the magnetic tape, the magnetic tape being used in a data recording apparatus that includes a data write head disposed such that a longitudinal direction of the data write head is inclined with respect to the width direction of the magnetic tape by a first head azimuth angle.

A magnetic tape cartridge includes a case in which a magnetic tape is accommodated and a storage medium provided in the case. At least one of reading or writing of data is performed by a plurality of magnetic elements, which are linearly disposed, with respect to the magnetic tape pulled out from the case. A disposition direction of the plurality of magnetic elements is tilted toward an entire length direction side of the magnetic tape with respect to a width direction of the magnetic tape. The storage medium stores tilt feature information indicating a feature of tilt of the disposition direction with respect to the width direction.

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 assembly capable of stably providing tilt for a magnetic head and a disk device having the same.SOLUTION: According to the embodiment, a suspension assembly includes: a wiring member provided on a support plate and having the support plate, a head mounting surface, and a support convex portion provided on the head mounting surface and including a first region having a first height and a second region having a second height lower than the first height; and a magnetic head that includes a slider having a mounting surface and a medium facing surface facing the mounting surface, and a head portion provided on the slider, in which the mounting surface is fixed to the head mounting surface overlapped on the support convex portion, and the medium facing surface is tilted so that second region side is lower than the head mounting surface.SELECTED DRAWING: Figure 8

To provide a head gimbal assembly for a hard disk drive device.SOLUTION: A gimbal has a base portion and a tongue joined together by a neck portion. The base portion includes a first proximal edge facing away from the tongue. A circuit is mounted on the gimbal and includes a portion mounted to the base portion having a circuit extension region that extends beyond the first proximal edge. The circuit extension region includes a second proximal edge facing away from the tongue. A slider may be mounted on the tongue and electrically connected to the circuit. First and second PZT actuators are mounted to the head gimbal assembly and electrically connected to the circuit. The circuit extension region has a circuit extension region width W of at least 0.1 mm as measured in a direction extending away from the tongue relative to a furthest extending portion of the first proximal edge and a furthest extending portion of the second proximal edge.SELECTED DRAWING: Figure 4

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

To satisfactorily perform recording and / or playback in recording and / or playback of data for a magnetic tape after storage accommodated in a magnetic tape cartridge, and adjust tension applied in a longitudinal direction of the magnetic tape to control a dimension in a width direction of the magnetic tape, thereby improving running stability in performing recording and / or playback.SOLUTION: A magnetic tape cartridge accommodating a magnetic tape and a magnetic recording playback device including the same are provided. In the magnetic tape, the maximum value of an amount of deformation of the magnetic tape after one-year storage in five environments is 0.50 μm or less. A ratio of a change in the amount of deformation of the magnetic tape to a change in relative humidity obtained from the five amounts of deformation of the magnetic tape is 0.0001 μm / % or more and 0.0500 μm / % or less. A ratio of a change in the amount of deformation of the magnetic tape to a change in a temperature obtained from the five amounts of deformation of the magnetic tape is 0.0010 μm / °C or more and 0.1000 μm / °C or less.SELECTED DRAWING: None

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 record and / or reproduce data excellently with a dimension in a width direction of the magnetic tape controlled by adjusting a tension to be applied in a longitudinal direction of the magnetic tape.SOLUTION: One embodiment of the present invention is a magnetic tape that is characterized in that, in a probability distribution PDΔSB of a differential ΔSB between servo band intervals to be calculated from TDSage, TDSenv and TC, a probability Pfail in wich an absolute value of ΔSB exceeds 0.3 μm is equal to or less than 0.2%. One embodiment of the present invention is a magnetic cartridge and a magnetic tape device that include the magnetic tape. The TDSage is a maximum value of an absolute value of a differential between the servo band interval obtained prior to a prescribed storage and the servo band interval obtained after the storage. The TDSenv is a value to be calculated by multiplying a differential between a maximum value and minimum value in the servo band intervals obtained respectively under prescribed five environments with 1 / 2. The TC is a value to be calculated by multiplying TDStens with 0.5N, in which the TDStens is a ratio of a change in servo band interval with respect to a change in tension to be calculated from respective servo band intervals obtained respectively under the prescribed five environments by applying a plurality of different tensions in a longitudinal direction of the magnetic tape.SELECTED DRAWING: None

This servowriter is provided with: a travel unit that causes a magnetic recording medium in tape form to travel by feeding the magnetic recording medium out from a cartridge and winding the magnetic recording medium which has been fed out; an erase unit that erases a first servo pattern which is formed on the traveling magnetic recording medium; a head that writes a servo signal so as to form a second servo pattern on the traveling magnetic recording medium from which the first servo pattern has been erased; and a control unit that, during at least one of an accelerating travel period and a decelerating travel period of the magnetic recording medium, controls the head to write the servo signal and form the second servo pattern, which does not satisfy a standard, on the magnetic recording medium.

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