公开(公告)号：US09019646B2

公开(公告)日：2015-04-28

申请号：US13831129

申请日：2013-03-14

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Jon D. Trantham ,  John West Dykes ,  Housan Dakroub ,  Charles Paul Henry ,  Edward Charles Gage ,  Raul Horacio Andruet ,  James Gary Wessel ,  James Dillon Kiely ,  Bruce Douglas Buch ,  Barmeshwar Vikramaditya

IPC: G11B5/02 ,  G11B13/04 ,  G11B5/31 ,  G11B5/60 ,  G11B5/00

CPC classification number: G11B13/04 ,  G11B5/314 ,  G11B5/6088 ,  G11B2005/0021

Abstract: An apparatus includes a write element configured to apply a magnetic field to write data on a portion of a heat-assisted magnetic recording media in response to an energizing current. An energy source is configured to heat the portion of the media being magnetized by the write element. A preheat energizing current is applied to the write element during an interval before writing the data to the portion of the media. The preheat energizing current does not cause data to be written to the media and brings at least one of the write element and driver circuitry into thermal equilibrium prior to writing the data on the portion.

Abstract translation: 一种装置包括：写入元件，其被配置为响应于激励电流施加磁场以在热辅助磁记录介质的一部分上写入数据。 能量源被配置为加热被写入元件磁化的介质的部分。 在将数据写入介质的一部分之前的间隔期间，将预热通电电流施加到写入元件。 在将数据写入该部分之前，预热通电电流不会导致数据被写入介质并且使写入元件和驱动器电路中的至少一个进入热平衡。

公开(公告)号：US08842503B1

公开(公告)日：2014-09-23

申请号：US13921676

申请日：2013-06-19

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Edward Charles Gage

IPC: G11B11/00 ,  G11B13/04

CPC classification number: G11B20/1217 ,  G11B5/012 ,  G11B5/09 ,  G11B2005/0021

Abstract: An apparatus comprises a write transducer, an energy source, and a controller. The write transducer is configured to write data to a magnetic recording medium, and the energy source is configured to heat the magnetic recording medium while it is being written to by the write transducer. The controller is coupled to the write transducer and configured to adjust at least an operating power of the energy source to selectably cause bits having variable bit aspect ratios to be written to the magnetic media.

Abstract translation: 一种装置包括写入传感器，能量源和控制器。 写入传感器被配置为将数据写入磁记录介质，并且能量源被配置为在被写入传感器写入时加热磁记录介质。 控制器耦合到写换能器并且被配置为至少调整能量源的工作功率，以可选择地使得具有可变位长宽比的位被写入到磁介质。

公开(公告)号：US20140029396A1

公开(公告)日：2014-01-30

申请号：US13831129

申请日：2013-03-14

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Tim Rausch ,  Jon D. Trantham ,  John West Dykes ,  Housan Dakroub ,  Charles Paul Henry ,  Edward Charles Gage ,  Raul Horacio Andruet ,  James Gary Wessel ,  James Dillon Kiely ,  Bruce Douglas Buch ,  Barmeshwar Vikramaditya

IPC: G11B13/04

CPC classification number: G11B13/04 ,  G11B5/314 ,  G11B5/6088 ,  G11B2005/0021

Abstract: An apparatus includes a write element configured to apply a magnetic field to write data on a portion of a heat-assisted magnetic recording media in response to an energizing current. An energy source is configured to heat the portion of the media being magnetized by the write element. A preheat energizing current is applied to the write element during an interval before writing the data to the portion of the media. The preheat energizing current does not cause data to be written to the media and brings at least one of the write element and driver circuitry into thermal equilibrium prior to writing the data on the portion.

Abstract translation: 一种装置包括：写入元件，其被配置为响应于激励电流施加磁场以在热辅助磁记录介质的一部分上写入数据。 能量源被配置为加热被写入元件磁化的介质的部分。 在将数据写入介质的一部分之前的间隔期间，将预热通电电流施加到写入元件。 在将数据写入该部分之前，预热通电电流不会导致数据被写入介质并且使写入元件和驱动器电路中的至少一个进入热平衡。

公开(公告)号：US11495249B1

公开(公告)日：2022-11-08

申请号：US17227958

申请日：2021-04-12

Applicant: Seagate Technology LLC

Inventor： Ian James Gilbert ,  Peng Peng ,  Todd Michael Lammers ,  Tim Rausch

IPC: G11B5/68 ,  G11B5/00 ,  G11B5/012

Abstract: Two or more different recording currents are applied to a write coil of a recording head. A first of the two or more currents is a positive current and a second of the two or more currents is a negative current. In response to the application of the two or more different recording currents, a data stream is recorded to regions of a moving continuous magnetic recording medium such that each region has three or more magnetic states. The three or more magnetic states can be read from the continuous magnetic recording medium via a magnetic read transducer to recover the data stream.

公开(公告)号：US10706876B1

公开(公告)日：2020-07-07

申请号：US16440306

申请日：2019-06-13

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Edward Charles Gage ,  Zengyuan Liu

IPC: G11B5/127 ,  G11B5/31 ,  G11B11/105 ,  G11B5/00

Abstract: A recording head for writing data on tracks of a data storage medium. 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 a writing-assistance wire that is positioned between the pole tip and the trailing shield in a down-track direction.

公开(公告)号：US10446186B1

公开(公告)日：2019-10-15

申请号：US16135634

申请日：2018-09-19

Applicant: Seagate Technology LLC

Inventor： Riyan Alex Mendonsa ,  Jason Bryce Gadbois ,  Tim Rausch ,  Brett R. Herdendorf ,  Krishnan Subramanian

IPC: G11B5/54 ,  G11B5/55 ,  G11B23/03 ,  G11B19/20 ,  G11B19/28

Abstract: Apparatus for data storage in a cartridge library archival system. In some embodiments, a plurality of portable data storage cartridges are provided. Each cartridge has a sealed housing which encloses at least one head-disc interface (HDI) with a magnetic data transducer adjacent a rotatable data recording medium. An access station has control electronics configured to transfer data signals between a memory and the transducer of a selected cartridge loaded to the access station. The access station further has an external voice coil motor (VCM) configured to engage and advance the transducer of the selected cartridge across a recording surface of the medium. A transport mechanism can be used to automatically load the cartridges to the access station. Multiple cartridges can be loaded sequentially or concurrently to support various data transfer operations.

公开(公告)号：US10395683B2

公开(公告)日：2019-08-27

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

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：US10339963B1

公开(公告)日：2019-07-02

申请号：US16025424

申请日：2018-07-02

Applicant: Seagate Technology LLC

Inventor： Drew Michael Mader ,  Ian James Gilbert ,  Walter R. Eppler ,  Tim Rausch

IPC: G11B11/00 ,  G11B5/09 ,  G11B5/00 ,  G11B5/60 ,  G11B7/1263 ,  G11B7/1267 ,  G11B7/126

Abstract: Pseudorandom bit sequences are recorded to a heat-assisted recording medium at a laser power that is stepped while recording the pseudorandom bit sequences. The pseudorandom bit sequences are read from the heat-assisted recording medium to determine timing differences between bits written before and after the laser power is stepped. A thermal gradient of bits written to the heat-assisted recording medium is determined based on the timing differences.

公开(公告)号：US09966100B1

公开(公告)日：2018-05-08

申请号：US15671262

申请日：2017-08-08

Applicant: Seagate Technology LLC

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

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

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

Abstract: Before writing to a heat-assisted magnetic recording medium, a DC signal modulated with an AC signal is applied to a laser of a read/write head. 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 target value of the DC signal that causes the modulation levels to reach a predetermined value between zero and a maximum value is determined and used to set a bias current for subsequent activation of the laser based.

公开(公告)号：US09947357B2

公开(公告)日：2018-04-17

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.