公开(公告)号：US20240312480A1

公开(公告)日：2024-09-19

申请号：US18461961

申请日：2023-09-06

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Manabu UEHARA

IPC: G11B5/012 ,  G11B5/02 ,  G11B5/105 ,  G11B5/48

CPC classification number: G11B5/012 ,  G11B5/02 ,  G11B5/105 ,  G11B5/483 ,  G11B5/4833 ,  G11B5/4846

Abstract: According to one embodiment, a disk device includes a magnetic disk, a suspension, a magnetic head, and a carriage. The magnetic disk rotates about a first rotation axis. The suspension includes a base plate, a load beam, and a flexure. The magnetic head is attached to the flexure and configured to read and write information from and to the magnetic disk. The carriage includes an arm to which the base plate is attached. The carriage rotates about a second rotation axis to move the magnetic head with respect to the magnetic disk. The base plate includes a first surface and a second surface. The first surface faces the magnetic disk when the magnetic head is located on the magnetic disk. The second surface is opposite the first surface and faces the arm. A component different from the arm is disposed on the second surface.

公开(公告)号：US11854581B2

公开(公告)日：2023-12-26

申请号：US17860343

申请日：2022-07-08

Applicant: Western Digital Technologies, Inc.

Inventor： Suping Song ,  Zhanjie Li ,  Terence T. Lam ,  Lijie Guan

IPC: G11B5/11 ,  G11B5/31 ,  G11B5/127 ,  G11B5/235 ,  G11B5/012 ,  G11B5/02 ,  G11B5/00

CPC classification number: G11B5/315 ,  G11B5/1278 ,  G11B5/235 ,  G11B5/3116 ,  G11B5/3133 ,  G11B5/3143 ,  G11B5/3146 ,  G11B5/012 ,  G11B5/02 ,  G11B5/11 ,  G11B2005/0024

Abstract: Embodiments of the present disclosure generally relate to a magnetic media drive employing a magnetic recording device. The magnetic recording device comprises a trailing gap disposed adjacent to a first surface of a main pole, a first side gap disposed adjacent to a second surface of the main pole, a second side gap disposed adjacent to a third surface of the main pole, and a leading gap disposed adjacent to a fourth surface of the main pole. A side shield surrounds the main pole and comprises a heavy metal first layer and a magnetic second layer. The first layer surrounds the first, second, and third surfaces of the main pole, or the second, third, and fourth surfaces of the main pole. The second layer surrounds the second and third surfaces of the main pole, and may further surround the fourth surface of the main pole.

公开(公告)号：US11817133B2

公开(公告)日：2023-11-14

申请号：US17652984

申请日：2022-03-01

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Kimiyasu Aida ,  Kazuya Takada

IPC: G11B5/02 ,  G11B5/55 ,  G06F3/06 ,  G11B20/18 ,  G11B27/36

CPC classification number: G11B5/02 ,  G06F3/0604 ,  G06F3/0656 ,  G06F3/0676 ,  G11B5/5573 ,  G11B27/36 ,  G11B2020/1826 ,  G11B2220/2508

Abstract: According to one embodiment, a magnetic disk device incudes a first magnetic disk, a first actuator that reads/writes data from/to the first magnetic disk, a first controller that controls the first actuator, a second magnetic disk, a second actuator that reads/writes data from/to the second magnetic disk, a second controller that controls the second actuator, wherein the first controller executes read/write processing, and the second controller stores trace data of the read/write processing when the first controller executes the read/write processing.

公开(公告)号：US20230306990A1

公开(公告)日：2023-09-28

申请号：US17903845

申请日：2022-09-06

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Ikuko IIDA

IPC: G11B5/02 ,  G11B27/34

CPC classification number: G11B5/02 ,  G11B27/34 ,  G11B2220/2516

Abstract: According to one embodiment, a disk device includes a magnetic disk and a control circuit. The magnetic disk includes a shingled magnetic recording (SMR) region where data is recorded such that adjacent tracks are partially overlapped with each other by SMR. The control circuit writes, at a predetermined timing, dummy data to a location on the magnetic disk. The location is located after a position indicated by a write pointer. The control circuit executes scan processing after the writing of the dummy data.

公开(公告)号：US20230298621A1

公开(公告)日：2023-09-21

申请号：US18322163

申请日：2023-05-23

Applicant: Western Digital Technologies, Inc.

Inventor： Joey M. POSS ,  Naoto ITO ,  Phillip S. HARALSON

IPC: G11B5/02 ,  G11B5/012

CPC classification number: G11B5/02 ,  G11B5/012 ,  G11B5/027

Abstract: A data storage device is disclosed comprising a head actuated over an energy assisted magnetic media comprising a plurality of data tracks, wherein each data track comprises a plurality of data sectors. A write operation to a first data sector is executed by applying a first current to a write coil of the head while the head is over a second data sector preceding the first data sector, wherein the first current comprises a first amplitude. A second current is applied to the write coil while the head is over the first data sector, wherein the second current comprises a second amplitude lower than the first amplitude.

公开(公告)号：US20230206949A1

公开(公告)日：2023-06-29

申请号：US17892947

申请日：2022-08-22

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Takahiro AOKI

IPC: G11B5/596 ,  G11B5/02

CPC classification number: G11B5/59638 ,  G11B5/59627 ,  G11B5/02

Abstract: According to one embodiment, a magnetic disk device comprises a disk, a first head, a second head, a controller. The disk includes a first surface and a second surface different from the first surface. The first head carries out read and write of data from and to the first surface. The second head carries out read and write of data from and to the second surface. The controller adjusts a spiral speed of at least one of the first head and the second head according to a cylinder offset amount corresponding to a positional difference between the first head and the second head. The spiral speed is a speed at which spiral servo patterns are to be written.

公开(公告)号：US10032467B2

公开(公告)日：2018-07-24

申请号：US15827230

申请日：2017-11-30

Applicant: Seagate Technology LLC

Inventor： Mark Anthony Gubbins ,  Robert William Lamberton ,  Robert Edward Weinstein ,  James Joseph Touchton

IPC: G11C5/02 ,  G11B5/02 ,  G11B20/10 ,  B82Y10/00 ,  G11B5/31 ,  G11B5/74 ,  G11B5/00 ,  G11B5/82

CPC classification number: G11B5/02 ,  B82Y10/00 ,  G11B5/3133 ,  G11B5/746 ,  G11B5/82 ,  G11B20/10009 ,  G11B20/10222 ,  G11B20/1024 ,  G11B20/10388 ,  G11B20/10425 ,  G11B2005/0005 ,  G11B2220/252

Abstract: The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal.

公开(公告)号：US10002624B1

公开(公告)日：2018-06-19

申请号：US15680343

申请日：2017-08-18

Applicant: Kabushiki Kaisha Toshiba

Inventor： Yoshihiro Amemiya

IPC: G11B5/02 ,  G11B5/09 ,  G11B5/012 ,  G11B5/00

CPC classification number: G11B5/09 ,  G11B5/012 ,  G11B5/02 ,  G11B20/10027 ,  G11B2005/0013 ,  G11B2005/0016 ,  G11B2005/0018

Abstract: According to one embodiment, a magnetic disk device includes a disk, a head configured to write data to the disk, and an integrated circuit configured to acquire a detection signal indicative of a first pattern of a first frequency of write data, change a first current of a second pattern of a write current corresponding to the first pattern on the basis of the detection signal, detect a third pattern of a second frequency which is greater than the first frequency from the write data, change a second current of a fourth pattern of the write current corresponding to the third pattern, and output the write current with the changed first current and the changed second current to the head.

公开(公告)号：US09934814B2

公开(公告)日：2018-04-03

申请号：US15083135

申请日：2016-03-28

Applicant: HGST Netherlands B.V.

Inventor： Yaw-Shing Tang

IPC: G11B5/02 ,  G11B20/10 ,  G11B5/00 ,  G11B5/012 ,  G11B5/455 ,  G11B5/60

CPC classification number: G11B20/10222 ,  G11B5/012 ,  G11B5/02 ,  G11B5/455 ,  G11B5/6088 ,  G11B20/10009 ,  G11B20/10037 ,  G11B2005/0021

Abstract: A system for compensating for heat induced transient phase shift in a heat assisted magnetic recording system. A heat assisted magnetic data recording system includes a near field thermal transducer that locally heats the media during writing. The thermal transducer, when activated, results in a change in size of a magnetic transition written to the magnetic media. This change in size of the thermal transition results in a transient phase shift of the data recorded on the magnetic media. The system includes circuitry for predetermining an anticipated amount of transient phase shift and adjusting a subsequent read signal to compensate for the known transient phase shift, thereby eliminating signal errors resulting from the transient phase shift.

公开(公告)号：US09881637B1

公开(公告)日：2018-01-30

申请号：US15435527

申请日：2017-02-17

Applicant: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.

Inventor： Ross Wilson ,  Andrew Krebs ,  Jaydip Bhaumik ,  Greg Starr ,  Scott O'Brien

IPC: G11B5/02 ,  G11B5/00

CPC classification number: G11B5/02 ,  G11B2005/0024

Abstract: An apparatus for microwave-assisted magnetic recording includes a magnetic write head operable to write data to a magnetic storage medium. The apparatus includes a spin-torque microwave oscillator coupled to the magnetic write head and operable to provide microwave radiation to the magnetic storage medium. The apparatus includes a driver circuit in communication with the magnetic write head. The driver circuit is operable to dynamically modulate bias current provided to the spin-torque microwave oscillator in sympathy with data being written to the magnetic storage medium by the magnetic write head.