242results about "Recording/reproducing/erasing methods" patented technology

According to an embodiment, tracks on a magnetic disk each include a long-distance sector having a length in the circumferential direction covering two or more servo sectors. A controller executes an acquisition operation to acquire one or more evaluation amounts on the basis of a track pitch in each of the two or more servo sectors included in a portion adjacent to the long-distance sector. The controller executes a protection operation to protect data of an adjacent track in a case where a total value of the one or more evaluation amounts exceeds a first threshold value.

Provided are a computer program product, device, system, and method for single data band data storage. In one embodiment, a tape head module has an array of four servo transducer elements for each servo band of a tape and an array of reader / writer transducer elements extending over most of the width of the tape. In another embodiment, a data storage tape has a top servo band positioned adjacent a top edge guard band of the tape, a bottom servo band positioned adjacent a bottom edge guard band of the tape, and a single data band positioned between the top and bottom servo bands and configured to receive tracks of data written by a tape head wherein the single data band width extends over most of the tape width.

Various illustrative aspects are directed to a data storage device comprising a disk, a read / write head configured to read data from and write data to the disk, a laser diode (LD) coupled to a nearfield transducer configured to heat an area of the disk near the read / write head, a first resistive temperature detector (RTD), a second RTD, and one or more processing devices configured to: apply a laser bias to the LD during a write operation; obtain a plurality of differential signal measurements, based at least in part on a plurality of measurements from each of the first and second RTDs; and adjust the laser bias applied to the LD, based at least in part on comparing the plurality of differential signal measurements to a target value for the differential signal.

To provide a magnetic recording / reproducing device that shortens the time required to form a lubricant filling area due to fluctuations in flying height, and a control method thereof.SOLUTION: In a control method for a magnetic recording / reproducing device according to the embodiment: after recording is performed by a thermally assisted magnetic recording head 10 at a head flying height of a first height, the head flying height is changed to a second height H2 higher than the first height; by operating the thermally assisted magnetic recording head 10, a lubricant is filled between the thermally assisted magnetic recording head 10 and a recording surface 1a; and a lubricant-filled region 29 including a lubricant-hardened material 26 and a hardened lubricant material 28, and having the second height H2 is formed.SELECTED DRAWING: Figure 8

In one embodiment, a head for a storage drive includes a support member having a first media facing surface, and a wafer chiplet disposed on the support member and having a second media facing surface. In one embodiment, the lateral width of the chiplet is less than the lateral width of the support member and is less than the range of tape head and magnetic tape relative lateral motion. In one aspect of the present description, the chiplet has a third media facing surface which blends with first media facing surface of the support member, and the second media facing surface of the chiplet. In one embodiment, the chiplet is disposed on the support member so that a first bank of transducers of the tape head is centered on the support member and a second bank of transducers is offset from the center of the support member.

This disclosure describes an apparatus that enables rapid transitions during microwave-assisted magnetic recording (MAMR) of storage media. In various aspects, the apparatus incorporates a driver circuit configured to provide a controlled bias current through separate source and sink output terminals, which respond to feedback signals. An MAMR sensor connects between the source and sink output terminals and generates microwave fields when receiving the controlled bias current from the driver circuit. A common-mode feedback (CMFB) loop connects to the source and sink output terminals, detects common-mode voltage (CMV), and delivers feedback signals to the driver circuit to maintain CMV regulation of the MAMR sensor. A differential voltage regulation loop connects to the source and sink output terminals, providing feedback signals that maintain the MAMR sensor voltage differential at a reference value. The apparatus controls the magnetic recording process of the MAMR sensor with rapid transition times.

According to one embodiment, a method of adjusting a magnetic recording and reproducing device is a method of adjusting a magnetic recording and reproducing device incorporating a heat-assisted magnetic recording head and a magnetic disk, and the method includes performing a first write operation at a first position on a recording surface, measuring a first error rate at a second position different in radial position from the first position, performing a second write operation and then measuring a second error rate, obtaining a first difference between the first error rate and the second error rate, measuring a third error rate at the first position, performing a third write operation and then measuring a fourth error rate, calculating a second difference between the third error rate and the fourth error rate, comparing the first difference with the second difference and determining a change in flying height.

A spin injection assisted magnetic recording structure is disclosed wherein a ferromagnetic (FM) layer and at least one spin preservation (SP) layer are formed between a main pole (MP) trailing side and a write shield (WS). Current (Ia) flows between the MP and WS, or is injected into the FM layer. As a result, the spin polarized electrons from the FM layer, which flow across one or two SP layers to generate a magnetization that enhances one or both of a local WS magnetization and return field, and a local MP magnetization and write field, respectively. A lead to the FM layer may be stitched to enable lower resistance and improve reliability. The FM layer may be recessed from the ABS to allow more overlap with the SP layer for lower current density while maintaining performance. Higher linear density and area density capability, and better reliability are achieved.

Mode hop detection is provided. A device includes circuitry to receive, from a reader element an indication of one or more properties of a magnetic medium detected by the reader element. The device includes circuitry to determine an envelope of the signal. The device includes circuitry to adjust, responsive to the envelope, a current provided to a laser configured to heat the magnetic medium.

The embodiment of the invention provides a magnetic tape, a driver, a magnetic tape system and electronic equipment, and aims to avoid failure of the whole magnetic tape system due to breakage of the magnetic tape in the magnetic tape system. The magnetic tape system comprises a magnetic tape, a read-write magnetic head, a page extractor and a controller, the magnetic tape comprises a plurality of storage pages which are arranged in a stacked mode, and in the read-write process of the magnetic tape, the controller can determine at least one target storage page from the storage pages. And then the controller can control the page fetcher to fetch the target storage page and control the read-write magnetic head to read data in the target storage page or write the data into the target storage page. The data is stored in the multiple storage pages, in the working process, the page taking device makes contact with the target storage page so as to take out the target storage page, compared with the mode that a magnetic tape is wound on a reel, the stress of the storage pages is small, and therefore the situation that the magnetic tape in a magnetic tape system breaks, and consequently the whole magnetic tape system fails is avoided.

A shingled magnetic recording (SMR) hard disk drive (HDD) receives a read command for data associated with a range of logical block addresses (LBAs). In situations where a first portion of valid data associated with the range of LBAs is stored in an SMR region of the HDD and a second portion of valid data associated with the range of LBAs is stored in a non-SMR region of the HDD, the first portion is read from the SMR region in a single disk access and copied to a first buffer of the HDD, and the second portion is read from the non-SMR region in one or more disk accesses and copied to a second buffer of the HDD. The valid data associated with the range of LBAs stored in the second buffer are copied to the first buffer to be combined with valid data associated with the range of LBAs stored in the first buffer, and the combined valid data is then transferred to the host to complete execution of the read command.

The present disclosure provides systems and methods for improved laser mode jump detection for hard disk drive applications. A solution for providing laser mode jump detection in a hard disk drive may include a first circuit for providing a signal having a step voltage, an amplitude of which may be adjusted according to a first control signal. The solution may include a second circuit that delays the signal for a period of time that may be adjusted according to a second control signal to produce a delayed signal. The solution may include a filter to receive the delayed signal as an input and provide an offset signal corresponding to a frequency response of a sensor as an output. The system may subtract the offset signal from a sensor signal of a sensor to provide an output.

To provide a magnetic recording / reproducing device and a method of adjusting the same for determining a flying height change of a thermally assisted magnetic recording head.SOLUTION: A method of adjusting a magnetic recording / reproducing device according to the embodiment is a method of adjusting a magnetic recording / reproducing device having a thermally assisted magnetic recording head and a magnetic disk, and includes: performing a first write operation at a first position on a recording surface; measuring a first error rate at a second position having a different radial directional position from the first position; measuring a second error rate after performing a second write operation; obtaining a first difference between the first error rate and the second error rate; measuring a third error rate at the first position; measuring a fourth error rate after performing a third write operation; obtaining a second difference between the third error rate and the fourth error rate; and determining a flying height change by comparing the first difference and the second difference.SELECTED DRAWING: Figure 1

To improve a thermal gradient of a near-field transducer (NFT) and increase an areal density capacity of a HAMR head.SOLUTION: An NFT includes a main pole (MP) 302, a two-layer transducer 304 positioned adjacent to the MP, a waveguide core 306, and a parabolic waveguide blocker 308 positioned adjacent to the waveguide core, wherein the parabolic waveguide blocker includes a parabolic shape having a surface exposed to an air-bearing surface (ABS) of a write head. The parabolic waveguide blocker reduces electromagnetic radiation from the waveguide core, recycles a scattering field emitted from the NFT to mitigate a thermal background in a recording medium, improves a thermal gradient, and increases an areal density capacity (ADC) of a hard disk drive write head.SELECTED DRAWING: Figure 3A

This disclosure provides systems, methods, and apparatus, including: a first magnet with a first remanence value and a first coercivity value, the first magnet having a first cross-sectional area substantially normal to a direction of magnetization of the first magnet; and a second magnet positioned in series with the first magnet, the second magnet with a second remanence value and a second coercivity value that is less than the first coercivity value, the second magnet having a second cross-sectional area substantially normal to a direction of magnetization of the second magnet. A ratio of the first cross-sectional area to the second cross-sectional area is equal to or greater than a ratio of the second remanence value to the first remanence value.

To provide a magnetic material device capable of suppressing oxidation of the magnetic material, reducing capacitance of a laminated body of the magnetic material, an insulating layer, or conductive layer, and driving at high frequencies.SOLUTION: In a magnetic wire device 60 as a magnetic material device, a magnetic wire 61 and a conducting wire 62 as magnetic materials are arranged via an insulating layer 63. The insulating layer 63 is a laminated body of an insulating non-oxidized film and an insulating oxide film. The insulating non-oxidized film is connected to the magnetic wire 61.SELECTED DRAWING: Figure 6

Provided in the present application are a magnetic recording medium, a positioning method, and a related device. The magnetic recording medium comprises a servo band and a positioning band, wherein the servo band is used for indicating longitudinal position information; and the positioning band is used for indicating physical position information, whch is used for indicating the real physical position of the longitudinal position information in the magnetic recording medium. In the magnetic recording medium, in addition to the existing servo band, a positioning band for indicating physical position information is additionally provided. The physical position information can indicate the real physical position of a certain point, and thus the position information of the magnetic recording medium at the logical level and the position information of the magnetic recording medium at the physical level are interconnected, facilitating physical-level processing on the magnetic recording medium by a user.

To provide a magnetic head with improved spintronic devices.SOLUTION: The present invention relates to a magnetic recording head having a local or non-local SOT spintronic device for a magnetic medium, such as a magnetic media drive. In the case of the magnetic recording head having a local SOT spintronic device, a main pole, a shield, a buffer layer disposed on the main pole, a spin Hall layer disposed on the buffer layer, and an intermediate layer disposed on the spin Hall layer are included, and the buffer layer is made of a predetermined material. In the case of the magnetic recording head 1300 having a non-local SOT spintronic device, a main magnetic pole 1302, a shield 1304, a spin blocking layer 1310, a non-magnetic layer, and a spin-orbit-torque (SOT) layer 1308 are included, and the SOT layer is recessed from a medium facing surface (MFS) by a distance of about 20 nm to about 100 nm. The ratio of the length of the SOT layer to the thickness of the SOT layer is greater than 1. The SOT layer consists of BiSb.SELECTED DRAWING: Figure 10A

Beginning of wrap (BOW) data set reading and writing for tape drives is provided. In response to reaching an end of wrap (EOW) while writing to tape, a tape directory (TD) is updated to include first data set information for a first data set written at the EOW of a first wrap. A second data set is written using normal write procedure from a BOW of a second wrap, the second wrap following the first wrap. The first data set information is overwritten with second data set information for the second data set written at BOW. When reading a BOW data set from tape, data set information is read from a TD. Based on determining whether the data set information corresponds to a BOW data set, a target Data Set ID and a target Tape Write Pass are set for reading the BOW data set.

A dielectric reproducing device and a dielectric recording and reproducing device that can improve the reproduction speed. A detection means is provided so as to be able to detect a polarization state of each bit 1a corresponding to the data recorded in a data recording layer by relatively scanning the data recording layer made of a dielectric material. A heating means is provided so as to be able to heat the bit to be detected to a predetermined temperature while the detection means detects the polarization state. A reproducing means is provided so as to be able to reproduce the data based on the polarization state of each bit detected by the detection means.

According to one embodiment, a magnetic disk device includes a disk, a write head, a write processing unit, an error correction unit, a correction limit prediction unit, and a determination unit. During a write period in which the write processing is executed on the second data track, the correction limit prediction unit is capable of determining whether or not data of each of the target sectors of the first data track is damaged, and generates prediction information, and the determination unit determines whether or not to cause the write processing unit to continue the write processing on the second data track based on the prediction information.

To provide a non-contact communication medium, a magnetic tape cartridge, a non-contact communication system, an operating method for the non-contact communication medium, and a program that can stabilize the supply of operating power to a processing circuit while enabling an external device to accurately read the contents of a response signal.SOLUTION: A non-contact communication medium communicates with an external device in a non-contact manner. The non-contact communication medium includes a resonant circuit, a regulator that generates operating power, a variable resistor, a switch, and a control circuit. The processing circuit generates a response signal in response to a command signal. The switch switches between a load-applying state in which a load of the variable resistor is applied to the resonant circuit and a non-loading state in which no load is applied to the resonant circuit in response to the response signal. The control circuit controls the resistance value in response to the escape power released from the regulator.SELECTED DRAWING: Figure 8

Various methods and systems are provided for implementing classification-based adjustable seek energy settings in storage device systems. In particular, operations support adjusting seek energy settings for storage device components, for executing requests. In operation, a classification is selected for a request. The classification indicates a first priority level for executing the request. The priority level is associated with a first adjustable seek energy setting of a plurality adjustable seek energy settings for executing requests on the hard disk drive system, where a seek energy setting is an adjustable operational speed or energy setting for the hard disk drive system. Based on the classification indicating the priority level, the classification is transmitted to cause the hard disk drive system to set the adjustable seek energy setting. One or more hardware components of the hard disk drive system operates to execute the first request based on the first adjustable seek energy setting.

The purpose of this disclosure is to provide a heat-assisted magnetic recording (HAMR) writer head with high magnetic field reliability and high accuracy. [Solution] Disclosed are a writer head for a heat-assisted magnetic recording device and a method for manufacturing a writer head. The writer head comprises a plurality of layers, including a waveguide cutoff layer, a waveguide layer, a near-field transducer layer, a heat sink layer, and a peg layer. Each layer has a tapered angle near the air bearing surface. The writer head further has a principal axis pole adjacent to an optical component having a similar tapered angle near the air bearing surface.

Provided is a magnetic disk device capable of suppressing errors in the positions of a target track and a magnetic head during a write operation. A controller of a magnetic disk device operates as follows in a first operation of writing to a data region while positioning a magnetic head. Namely, the controller demodulates the pulse train pattern to obtain a first pulse train demodulated value, and corrects the first pulse train demodulated value on the basis of a correction algorithm using a first set value as an independent variable. The controller calculates an offset amount of the magnetic head from one of the plurality of servo tracks on the basis of the corrected first pulse train demodulation value.

Provided is a magnetic recording device capable of achieving an increase in recording density. According to an embodiment, the magnetic recording device includes a magnetic head and a control section. The magnetic head includes a first magnetic pole, a magnetic element, and a coil, and the magnetic element includes a magnetic layer. The control section is electrically connected to the magnetic element and the coil. The control section is capable of supplying a recording current to the coil and an element current to the magnetic element. The recording current includes a first period of a first polarity, a second period of a second polarity different from the first polarity, a third period of transition from the first period to the second period, and a fourth period of transition from the second period to the first period. The element current includes a direct current component and an alternating current component. The alternating current component in the first period is the same as the alternating current component in the second period, the alternating current component in the third period, and the alternating current component in the fourth period.

To provide a method for producing a magnetic recording medium capable of having a magnetic layer with high crystal orientation and few defects, a magnetic recording medium, and a magnetic storage device.SOLUTION: A method of producing a magnetic recording medium 1 includes: a step of forming a magnesium oxide underlayer 20 on a surface of a substrate 10 by a sputtering method with using a target containing magnesium oxide; and a step of forming a magnetic layer 30 on the surface side of the magnesium oxide underlayer 20, in which the target containing the magnesium oxide is heated to more than 600°C when forming the magnesium oxide underlayer 20.SELECTED DRAWING: Figure 1

A Data Storage Device (DSD) comprises a magnetic disk and a slider including a writer configured to magnetically write data on the magnetic disk. A voltage is applied to the slider to provide a target offset voltage between the slider and the magnetic disk with the applied voltage differing from a disk voltage of the magnetic disk. In one aspect, a first disk voltage is determined for the magnetic disk. The voltage to be applied to the slider is determined to adjust an electric potential difference between the slider and the disk to the non-zero target offset voltage. In another aspect, the voltage applied to the slider is less than the disk voltage and reduces deterioration of the slider caused by operation of an energy-assisted magnetic recording technology at the slider while maintaining a safe fly height of the slider over the magnetic disk.