公开(公告)号：US11270733B2

公开(公告)日：2022-03-08

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: G11B11/105 ,  G11B20/10 ,  G11B5/73 ,  G11B20/18 ,  G11B5/00 ,  G11B7/126 ,  G11B7/1263 ,  G11B7/1267

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：US10290319B1

公开(公告)日：2019-05-14

申请号：US16058819

申请日：2018-08-08

Applicant: Seagate Technology LLC

Inventor： Antonia Tsoukatos ,  Tim Rausch ,  Mehmet Fatih Erden ,  Benjamin W Parish ,  Prasanna Manja Ramakrishna ,  Morovat Bryan Tayefeh ,  Sai Sian Hon ,  ChengYi Guo ,  Teck Khoon Lim ,  Song Wee Teo

IPC: G11B27/36 ,  G11B20/18 ,  G11B5/596 ,  G11B19/04

Abstract: A method for performing a flaw scan test on a hard disk drive is disclosed. The hard disk drive includes a magnetic recording medium and spindle motor associated with a predetermined rated speed. The method includes writing a test pattern to the magnetic recording medium while operating the spindle motor at a speed greater than the predetermined rated speed. The method also includes reading the test pattern at the greater speed and detecting flaws in response to reading the test pattern.

公开(公告)号：US09830942B1

公开(公告)日：2017-11-28

申请号：US15233298

申请日：2016-08-10

Applicant: Seagate Technology LLC

Inventor： Drew Michael Mader ,  Jason Charles Jury ,  Tim Rausch ,  Raman Venkataramani

IPC: G11B11/00 ,  G11B20/10 ,  G11B5/00 ,  G11B20/14

CPC classification number: G11B20/10481 ,  G11B20/10009 ,  G11B20/10194 ,  G11B20/1407 ,  G11B20/1426 ,  G11B2005/0021

Abstract: First and second different write precompensation values are associated with different first and second non-return-to-zero, inverted (NRZI) data patterns. The first and second different write precompensation values cause a predetermined phase shift to be written into test data that comprises the first and second NRZI data patterns. The test data is mitten to a recording medium of a storage device using the first and second write precompensation value. The test data is used to determine a response of the storage device to the predetermined phase shift.

公开(公告)号：US09792949B1

公开(公告)日：2017-10-17

申请号：US15414288

申请日：2017-01-24

Applicant: Seagate Technology LLC

Inventor： Minjie Ma ,  Tim Rausch ,  Edward Charles Gage ,  Pu-Ling Lu

IPC: G11B11/00 ,  G11B20/18 ,  G11B5/00 ,  G11B7/1267 ,  G11B5/09

CPC classification number: G11B20/1816 ,  G11B5/09 ,  G11B5/455 ,  G11B7/1267 ,  G11B20/10305 ,  G11B2005/0021

Abstract: An apparatus and method provide for performing, using a heat-assisted magnetic recording head, multiple sequential writes to a recording medium, and recording a metric of write performance for each of the writes. The apparatus and method further provide for calculating fluctuations in the metric, detecting whether the head has a laser mode hopping problem using the metric fluctuations, and categorizing a severity of the laser mode hopping problem.

公开(公告)号：US09747942B2

公开(公告)日：2017-08-29

申请号：US14688598

申请日：2015-04-16

Applicant: Seagate Technology LLC

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

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

CPC classification number: G11B20/1217 ,  G11B5/012 ,  G11B5/02 ,  G11B5/4866 ,  G11B5/6088 ,  G11B7/0037 ,  G11B20/1258 ,  G11B2005/0021 ,  G11B2020/1087 ,  G11B2020/10888 ,  G11B2020/1238 ,  G11B2020/1264 ,  G11B2020/1292

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：US09672845B2

公开(公告)日：2017-06-06

申请号：US14833342

申请日：2015-08-24

Applicant: Seagate Technology LLC

Inventor： Tim Rausch

IPC: G11B5/56 ,  G11B5/09 ,  G11B5/012 ,  G11B20/18 ,  G11B11/105 ,  G11B5/00 ,  G11B20/12 ,  G11B5/596

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 includes a controller that selects an offset when preparing to write data to a target data track. The offset defines a position for a write head relative to a center of the target track and is selected based on a radial position of a write head at the target data track.

公开(公告)号：US09633675B2

公开(公告)日：2017-04-25

申请号：US14879869

申请日：2015-10-09

Applicant: Seagate Technology LLC

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

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

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 includes a storage medium having a first set of non-adjacent data tracks having a number of super parity sectors and a second set of non-adjacent data tracks interlaced with the first set of non-adjacent data tracks. The number of super parity sectors on a data track of the first set of non-adjacent data tracks is selected based on a distance between the data track and an inner diameter of the storage medium.

公开(公告)号：US09607631B2

公开(公告)日：2017-03-28

申请号：US14950577

申请日：2015-11-24

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Minjie Ma ,  Steven Granz ,  Kaizhong Gao ,  Wenzhong Zhu ,  Edward C. Gage

IPC: G11B5/09 ,  G11B5/012 ,  G11B11/105 ,  G11B5/00

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 includes a storage controller configured to write a band of data tracks using a first recording method until criterion is met. The first method may be a conventional recording method. After the criterion is met, the storage controller is configured to write data to the band using a second recording method. The second recording method may be an enhanced capacity recording method such as interlaced magnetic recording (IMR) or shingled magnetic recording (SMR).

公开(公告)号：US09569121B1

公开(公告)日：2017-02-14

申请号：US14952049

申请日：2015-11-25

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Douglas Murphy ,  John W. Dykes ,  Jason Zimmerman ,  James C. Hatfield

IPC: G11B11/00 ,  G06F3/06 ,  G11B7/1387 ,  G11B5/09 ,  G11B5/00

CPC classification number: G11B7/1387 ,  G11B5/02 ,  G11B5/40 ,  G11B19/048 ,  G11B27/36 ,  G11B2005/0021 ,  G11B2220/2516

Abstract: Method and apparatus for managing a data storage system that utilizes heat assisted magnetic recording (HAMR). In some embodiments, the method includes recording data to a storage medium using the HAMR system, accumulating a usage statistic indicative of actual elapsed operation of the HAMR system, and setting an indication value in a memory indicative of an estimate of remaining available elapsed operation of the HAMR system. The estimate of remaining available elapsed operation is determined in relation to the usage statistic and an estimated total elapsed operation value.

Abstract translation: 用于管理利用热辅助磁记录（HAMR）的数据存储系统的方法和装置。 在一些实施例中，该方法包括使用HAMR系统将数据记录到存储介质中，累积指示HAMR系统的实际经过的操作的使用统计量，以及在存储器中设置指示值，该指示值指示剩余可用经过操作的估计 HAMR系统。 相对于使用统计量和估计的总经过操作值确定剩余可用经过操作的估计。

公开(公告)号：US09502062B1

公开(公告)日：2016-11-22

申请号：US14928668

申请日：2015-10-30

Applicant: Seagate Technology LLC

Inventor： Andrei Dorobantu ,  Thomas C. Zirps ,  Tim Rausch

IPC: G11B5/596 ,  G11B5/00

CPC classification number: G11B5/59627 ,  G11B2005/0021

Abstract: First and second repeatable runout (ZAP) values are both located on a first virtual track of a magnetic disk. The first ZAP value is offset from the first virtual track center in a first direction and the second ZAP value is offset from the first virtual track center in a second direction opposite the first direction. At least one of the first and second ZAP values are accessed when performing repeatable runout correction for a writer of the read/write head that is being positioned over a second virtual track of the magnetic disk.

Abstract translation: 第一和第二可重复跳动（ZAP）值均位于磁盘的第一虚拟轨道上。 第一ZAP值在第一方向上偏离第一虚拟轨道中心，并且第二ZAP值在与第一方向相反的第二方向上偏离第一虚拟轨道中心。 当对位于磁盘的第二虚拟轨道上的读/写头的写入器执行可重复的跳动校正时，访问第一和第二ZAP值中的至少一个。