73results about "Track finding/aligning" patented technology

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.

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 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 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

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 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

To provide a magnetic disk device capable of suitably performing rewrite operations caused by ATI (Automatic Time Indicator). [Solution] The controller performs an addition to the value of a counter corresponding to a neighboring memory area of ​​one of the multiple memory areas in response to a write operation. The rewrite operation includes a seek operation, a stabilization operation that waits for the residual vibration of the magnetic head to decay, and rewriting all the data of the first memory area to the first memory area after the stabilization operation. The controller decrements the value of the counter corresponding to the first memory area among the multiple counters in response to the rewrite operation. The controller performs an addition to the value of the counter corresponding to the second memory area among the multiple counters in response to the rewrite operation. The stabilization operation includes an operation that determines whether the stabilization operation is complete based on whether a first condition is met. The first condition differs depending on the trigger for executing the retry operation.

Provided are: a magnetic tape cartridge in which a magnetic tape is accommodated; and a magnetic recording / playback device including the magnetic tape cartridge. The magnetic tape includes a polyethylene naphthalate support having a Young's modulus in the width direction of 10,000 MPa or more. A medium life of the magnetic tape calculated using a linear function of logarithm logeT of A and T is 3 years or more, which is derived from a value of A and a value of logarithm logeT of T which are respectively obtained when A is the maximum value of the absolute value of the difference between the servo band interval obtained before storage under an environment of 32 °C and a relative humidity of 80% and the servo band interval obtained after storage for the storage time T under said environment, and T is 24 hours, 48 hours, 72 hours, 96 hours, or 120 hours.

To provide a data processing device, a magnetic recording / reproducing device, and a magnetic recording / reproducing system capable of deriving appropriate control conditions.SOLUTION: According to an embodiment, a data processing device includes an interface unit capable of acquiring partial data regarding control conditions of a magnetic recording / reproducing device and a processing unit capable of processing the partial data. The processing unit can process the partial data based on the characteristics of the partial data with a first model and derive first data. A first resolution of the first data is higher than a partial resolution of the partial data. The processing unit can process the partial data based on the characteristics with a second model and derive second data. The second mode is different from the first model and a second resolution of the second data is higher than the partial resolution.SELECTED DRAWING: Figure 1

A hard disk drive includes: a plurality of disk media mounted on a main shaft in which an outer diameter of each disk media is offset from an inner diameter of the disk media in the same direction along a rotation axis of the main shaft; and a load / unload ramp positioned to align correspondingly with the outer diameter of the disk media based on the offset. Thus, curvature of irregular disk media, such as curvature associated with thinner and thinner disks, is mitigated by grouping similarly characterized irregular disks together on a given principal axis and compensating for ramps accordingly.

To provide a magnetic disk device, a control method, and a program to improve faster seek control and settling accuracy.SOLUTION: A magnetic disk device includes a magnetic disk, an arm; a support member provided at a tip of the arm; a magnetic head that is provided to the support member and accesses to the magnetic disk; a first actuator that rotates the arm; a second actuator that drives the support member; and a control unit that performs seek control of the magnetic head. The control unit includes a feedback control unit and a repeated learning control unit. The feedback control unit controls a first command value for driving the first actuator so as to reduce errors between the position of the magnetic head and a target position. The repeated learning control unit inputs an input value based on the errors and outputs a second command value for driving the second actuator by repeated learning.SELECTED DRAWING: Figure 5

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 is provided, the magnetic tape exhibiting a nonlinear component of a signal phase difference of 17.5 nm or less after 10-day storage in an environment with temperature of 60°C and relative humidity of 20%. Also provided are a magnetic tape cartridge comprising the magnetic tape, and a magnetic tape device.SELECTED DRAWING: None

To provide actuator assemblies and magnetic disk devices that prevent interference and contact, and offer improved reliability. [Solution] According to the embodiment, the actuator assembly comprises a first head suspension assembly having a suspension having a first surface and a second surface, and a piezoelectric element mounted on the suspension and joined to the suspension by a first conductive adhesive applied to the second surface, and a second head suspension assembly having a suspension having a first surface and a second surface, and a piezoelectric element mounted on the suspension and joined to the suspension by a second conductive adhesive applied to the second surface. The second surfaces of the suspensions of the first head suspension assembly and the second head suspension assembly are facing each other, and the piezoelectric elements are facing each other. The top of the first conductive adhesive is positioned offset in the direction of the suspension relative to the top of the second conductive adhesive.

To provide a servo writer that reduces the number of cartridges to be discarded.SOLUTION: A servo writer 210 for a cartridge 10 includes: a traveling portion that feeds out a tape-shaped magnetic recording medium (magnetic tape MT) from the cartridge and winds the feed magnetic recording medium to make the magnetic recording medium travel; a demagnetizing magnet 214 that erases a first servo pattern formed on the traveling magnetic recording medium; a servo signal writing head 215 that writes a servo signal onto the traveling magnetic recording medium after the first servo pattern is erased and forms a second servo pattern; and a control device that controls the head to write the servo signal during at least one of acceleration and deceleration traveling periods of the magnetic recording medium and forms the second servo pattern that does not satisfy the standard on the magnetic recording medium.SELECTED DRAWING: Figure 8

To provide a magnetic recording medium with which excellent electromagnetic conversion characteristics can be obtained.A magnetic recording medium is a tape-type magnetic recording medium and includes a base body and a magnetic layer. An average thickness of the magnetic recording medium is 5.30 μm or less. When a power spectral density at each position of spatial wavelength λn=100 / n [μm] (provided that n is an integer of 1 or more and 255 or less) is obtained using a 2D surface profile image of a measurement range of 100 [μm]×100 [μm], that has been acquired by measuring a surface on a side of the magnetic layer by an atomic force microscope, a ratio Iλn≤5 / I10≤λn≤20 between an average value Iλn≤5 of integrated values of the power spectral density within a range of spatial wavelength λn≤5μm and an average value I10≤λn≤20 of integrated values of the power spectral density within a range of 10 μm≤spatial wavelength λn≤20 μm is 3.00 or less. An average value of a kurtosis on the surface on the side of the magnetic layer is 5.50 or less.

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 a tape thickness of the magnetic tape is 5.2 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 tape that can exhibit excellent electromagnetic conversion characteristics, and suppresses large reduction in the electromagnetic conversion characteristics in recording and / or playing back data at different head inclination angles.SOLUTION: There is provided a magnetic tape in which arithmetic average roughness Ra measured by an atomic force microscope on a surface of a magnetic layer is 2.0 nm or less, in an environment of a temperature of 23°C and relative humidity of 50%, an 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 an 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

The present invention provides a data processing device, a magnetic recording device, a method for manufacturing a magnetic recording device, and a data processing method that enable improved efficiency. [Solution] The data processing device includes an acquisition unit and a processing unit. The acquisition unit is configured to acquire a plurality of second data corresponding to at least a portion of waveform data including a first data. The processing unit is configured to perform a first operation and a second operation. In the first operation, the processing unit is configured to correct the first operation so that the difference between the first data and a fourth data obtained by interpolating a plurality of third data obtained by processing the plurality of second data by the first operation is reduced. In the second operation, the processing unit is configured to derive a plurality of sixth data by processing a plurality of fifth data by the corrected first operation.

To provide a magnetic tape device capable of satisfactorily recording and / or reproducing data when recording and / or reproducing the data by changing a tilt angle of a head during a magnetic tape running.SOLUTION: A magnetic tape has a non-magnetic support body and a magnetic layer containing ferromagnetic powder. The number of recesses having an equivalent circle diameter of 0.30 μm or more and 0.60 μm or less on a surface of a magnetic layer is 10 or more and 600 or less per area of 40 μm×40 μm, and the standard deviation σ of the number of recesses is 100 or less. A magnetic tape cartridge and a magnetic tape device include the magnetic tape.SELECTED DRAWING: None

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. In a binarized image of a secondary electronic image obtained by imaging a surface of the magnetic layer using a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions with circle-equivalent diameters of 60 nm to less than 120 nm, is 8000 to 30000, inclusive. A standard deviation σ of the number of bright regions in a width direction of the surface of the magnetic layer is 2000 or less.SELECTED DRAWING: None

To provide a magnetic disk device having high performance of write operation.SOLUTION: The controller executes the determination operation as the magnetic head passes through the servo sector during the write operation. In the determination operation, the controller calculates a first cumulative amount obtained by accumulating, in a first section, an evaluation amount corresponding to an amount by which the width of the adjacent track is narrowed by the write operation, and determines whether the first cumulative amount is smaller or larger than a threshold value corresponding to a correction limit of error correction in units of tracks. The first period includes a second period in which writing of data is completed and a third period in which data is written following the second period. The controller performs a write operation in response to determining that the first cumulative amount is larger than the threshold value by the determination operation, executes a rotational delay, and then re-executes the determination operation. The controller resumes the write operation in response to determining that the first cumulative amount is smaller than the threshold value by the re-executed determination operation.SELECTED DRAWING: Figure 9

To provide a magnetic tape which may contribute to operational stability improvement of a drive during recording and / or reproduction after prolonged storage.SOLUTION: A magnetic tape is provided, comprising a non-magnetic support body and a magnetic layer containing ferromagnetic powder and having a 1-bromonaphthalene contact angle in a range of 45.0° to 55.0°, inclusive, as measured on a surface thereof and a standard deviation σ of the angle of 1.0° or less in a width direction of the surface thereof. Also provided are a magnetic tape cartridge and a magnetic tape device that comprise the magnetic tape.SELECTED DRAWING: None

Properly controlling the operation of the magnetic head. [Solution] In the magnetic disk device of the embodiment, the controller, while writing to the first track among the plurality of tracks, determines using a determination model whether the position of the magnetic head moves from the target position on the first track to the side of the second track which is different from the first track among the plurality of tracks, and whether the radial distance from the target position to the position of the magnetic head exceeds a threshold. If the distance does not exceed the threshold, the controller performs writing to the first track, and if the distance exceeds the threshold, the controller does not perform writing to the first track. The determination model is a trained model that takes multiple position error information obtained by reading the servo information from each of the plurality of servo regions as input and outputs whether the distance exceeds the threshold while the magnetic head moves through the plurality of servo regions.

To provide a magnetic disk drive capable of suitable servo control. [Solution] The magnetic disk device comprises a magnetic head and a magnetic disk. Multiple servo regions, each containing multiple data fragments, are arranged at equal intervals in the circumferential direction on the magnetic disk, with servo data written to them in a circumferential direction. At multiple consecutive first radial positions, the recording frequency of the servo data differs for each first radial position. In each of the multiple servo regions, the first data fragment among the multiple data fragments is written to a first circumferential position where the circumferential movement time of the magnetic head, based on the timing when the magnetic head passes a reference position on the circumference, is aligned among the multiple first radial positions.

To provide a magnetic tape which may contribute to operational stability improvement of a drive during recording and / or reproduction after prolonged storage.SOLUTION: A magnetic tape is provided, comprising a non-magnetic support body and a magnetic layer containing ferromagnetic powder and having a friction coefficient of 0.35 or less as measured on a base material portion of a surface thereof and a standard deviation σ of the friction coefficient of 0.05 or less in a width direction of the surface thereof. Also provided are a magnetic tape cartridge and a magnetic tape device that comprise the magnetic tape.SELECTED DRAWING: None

The present invention provides a magnetic disk device and a control method therefor that can accurately detect sync marks on a spiral pattern. [Solution] Multiple adjustment patterns with different frequencies are written to each magnetic disk by each magnetic head. Each written adjustment pattern is read by each magnetic head, and the number of sync marks contained in the read signal is detected. The frequency of the adjustment pattern that yields a number of detected marks above a threshold is selected as the write frequency for each magnetic head. A spiral pattern with the same frequency as the selected write frequency is written to each magnetic disk by each magnetic head. While tracking the written spiral pattern, a servo pattern that serves as the reference for the seek positioning control of each magnetic head is written to each magnetic disk by each magnetic head.

On a magnetic tape, a plurality of servo patterns are recorded along a longitudinal direction. The servo pattern is at least one linear magnetized area pair. The linear magnetized area pair comprises a first linear magnetized area that is linearly magnetized and a second linear magnetized area that is linearly magnetized. The first linear magnetized area and the second linear magnetized area are inclined in mutually opposite directions with respect to a first virtual straight line along a width direction of the magnetic tape. The angle of inclination of the first linear magnetized area relative to the first virtual straight line is steeper than the angle of inclination of the second linear magnetized area.