公开(公告)号：US11341990B1

公开(公告)日：2022-05-24

申请号：US17330547

申请日：2021-05-26

Applicant: Seagate Technology LLC

Inventor： Zengyuan Liu ,  Edward Charles Gage ,  Tim Rausch ,  Stephanie Hernandez

IPC: G11B5/245 ,  G11B5/39 ,  G11B5/00

Abstract: A recording head for writing data on tracks of a data storage medium is provided. The recording head includes a writer having a write pole and a trailing shield. The write pole includes a pole tip configured to write on the tracks of the data storage medium. The recording head also includes first and second writing-assistance wires positioned between the pole tip and the trailing shield in a down-track direction to enable a writing-assistance current to be provided to produce an assist magnetic field that augments a write field produced by the write pole.

公开(公告)号：US20210407546A1

公开(公告)日：2021-12-30

申请号：US17323474

申请日：2021-05-18

Applicant: Seagate Technology LLC

Inventor： Ian James Gilbert ,  Peng Peng ,  Tim Rausch ,  Jan-Ulrich Thiele

IPC: G11B20/10 ,  G11B20/18 ,  G11B5/73

Abstract: A disk drive apparatus determines a pattern of bits of a data signal applied to a magnetic write transducer of a heat-assisted magnetic recording apparatus. The magnetic write transducer applies a magnetic field to a recording medium in response to the data signal. A laser power signal is applied to a laser that heats the recording medium while the magnetic field is applied. The laser power signal is modulated based on the pattern of bits. The modulation reduces differences between track widths of recorded marks having different elapsed time values and/or increases a signal-to-noise ratio of the recorded marks having different elapsed time values.

公开(公告)号：US10204655B1

公开(公告)日：2019-02-12

申请号：US15784509

申请日：2017-10-16

Applicant: Seagate Technology LLC

Inventor： Minjie Ma ,  Tim Rausch ,  Edward Charles Gage ,  James Dillon Kiely ,  Paul M. Jones ,  Yang Yang

IPC: G11B11/00 ,  G11B21/10 ,  G11B5/00 ,  G11B7/126 ,  G11B7/1267 ,  G11B7/1263 ,  G11B5/60

Abstract: Data is written to data sectors of a heat-assisted magnetic recording (HAMR) medium using a laser of a HAMR head supplied with a sum of an operational current and a threshold current. A service current is supplied to the laser when the head is over servo sectors of the medium, such that a temperature of the medium at the servo sectors is greater than or equal to a temperature of the head when over the servo sectors.

公开(公告)号：US20190019531A1

公开(公告)日：2019-01-17

申请号：US16136552

申请日：2018-09-20

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Tatsuya Shimizu ,  Wai Yuen Lai ,  Kai Chiu Cheung

IPC: G11B5/60 ,  G11B5/00

CPC classification number: G11B5/607 ,  G11B5/6088 ,  G11B2005/0021

Abstract: A heater power of a heat-assisted magnetic recording head is set based on an initial head-medium clearance estimate in response to the heater power. For a plurality of iterations, an optimum laser power of the recording head is determined and a heater power is set for a next iteration that results in an optimum heater power for the optimum laser power. If differences in the heater and laser powers between two subsequent iterations are below thresholds, the iterations are stopped and the optimum heater power and the optimum laser power for one of the subsequent iterations are used as an operational heater power and an operational laser power.

公开(公告)号：US10090016B2

公开(公告)日：2018-10-02

申请号：US15667904

申请日：2017-08-03

Applicant: Seagate Technology LLC

Inventor： Kaizhong Gao ,  Wenzhong Zhu ,  Tim Rausch ,  Edward Gage

IPC: G11B5/02 ,  G11B20/12 ,  G11B5/012 ,  G11B5/00 ,  G11B5/60 ,  G11B5/48 ,  G11B7/0037 ,  G11B20/10

Abstract: A storage device controller is configured to select one of multiple written track widths for a storage location based on a write attribute of data to be recorded at the storage location. According to one implementation, the storage device controller is further configured to select a power level for a heat-assisted magnetic recording (HAMR) device based on the write attribute.

公开(公告)号：US10049698B2

公开(公告)日：2018-08-14

申请号：US15475665

申请日：2017-03-31

Applicant: Seagate Technology LLC

Inventor： Wenzhong Zhu ,  Kaizhong Gao ,  Tim Rausch ,  Edward Charles Gage

IPC: G11B5/09 ,  G11B20/18 ,  G11B5/012 ,  G11B20/12 ,  G11B27/30

Abstract: A storage device includes a storage medium having a plurality of data tracks. At least one data track of the plurality of data tracks includes a number of super parity sectors. The number of super parity sectors selected for the at least one data tracks is selected based on a distance between an inner diameter of the storage medium and the data track. The number of super parity sectors provides error correction code for the at least one data track.

公开(公告)号：US09916849B1

公开(公告)日：2018-03-13

申请号：US15347129

申请日：2016-11-09

Applicant: Seagate Technology LLC

Inventor： Drew Michael Mader ,  Tim Rausch ,  James E. Angelo

IPC: G11B11/00 ,  G11B7/1263 ,  G11B7/126 ,  G11B5/00 ,  G11B5/60 ,  G11B11/105 ,  G11B7/1267

CPC classification number: G11B7/126 ,  G11B5/012 ,  G11B5/6088 ,  G11B7/1267 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

Abstract: An optical power level applied via a laser when recording data to a track of a heat-assisted recording medium is determined. In response to the optical power level being too low or too high, remedial action is taken to prevent loss of data on one or more of the track and an adjacent track.

公开(公告)号：US20170287514A1

公开(公告)日：2017-10-05

申请号：US15086959

申请日：2016-03-31

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Jon D. Trantham ,  Jason Bryce Gadbois

IPC: G11B5/60

CPC classification number: G11B5/607 ,  G11B5/02 ,  G11B5/3977 ,  G11B5/4853

Abstract: A read/write head has a set of components that at least include: at least one clearance actuator; at least one read transducer configured to read from a magnetic recording medium; and at least one write transducer configured to write to the magnetic recording medium. A switch network is coupled to the set of components and configured to, in response to a control signal, couple a selected sub-combination of the components to a common set of signal lines. The coupling of the selected sub-combination facilitates operation in a selected mode of the read/write head.

公开(公告)号：US09741386B1

公开(公告)日：2017-08-22

申请号：US15333761

申请日：2016-10-25

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Edward Charles Gage ,  Joshua Ward Christensen ,  Todd Michael Lammers

IPC: G11B5/02 ,  G11B7/00 ,  G11B7/1263 ,  H01S5/042 ,  H01S5/0683 ,  G11B5/012 ,  G11B5/00

CPC classification number: G11B5/012 ,  G11B2005/0021 ,  H01S5/0427 ,  H01S5/0683

Abstract: Before writing to a heat-assisted magnetic recording medium, a current of a laser is modulated about a default threshold current level. A modulation level of an optical power sensor is measured, the optical power sensor being coupled to detect optical output of the laser in response to the modulated current. A bias current for subsequent activation of the laser is adjusted based on the modulation level of the optical power sensor.

公开(公告)号：US09741364B2

公开(公告)日：2017-08-22

申请号：US14806417

申请日：2015-07-22

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Minjie Ma ,  Kaizhong Gao ,  Edward Gage

IPC: G11B5/02 ,  G11B5/09 ,  G11B5/012 ,  G11B20/18 ,  G11B11/105 ,  G11B5/00 ,  G11B20/12 ,  G11B5/596 ,  G11B5/60

CPC classification number: G11B20/1889 ,  G11B5/012 ,  G11B5/09 ,  G11B5/59633 ,  G11B5/59638 ,  G11B5/6088 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10521 ,  G11B11/10595 ,  G11B20/12 ,  G11B20/1217 ,  G11B20/1833 ,  G11B27/3027 ,  G11B2005/0021 ,  G11B2020/1222 ,  G11B2020/1232 ,  G11B2020/1238 ,  G11B2020/1292

Abstract: A storage device disclosed herein stores data on a storage media using interlaced magnetic recording (IMR) and it includes a storage controller configured to determine power levels applied to the power source such that power levels applied to heat various tracks can be different from each other. An implementation of the storage device determines the track density, linear densities and power levels for even and odd tracks in IMR HAMR for the storage media.