公开(公告)号：US20210373808A1

公开(公告)日：2021-12-02

申请号：US16887257

申请日：2020-05-29

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Jin Quan Shen

IPC: G06F3/06 ,  G06F9/48 ,  G06F9/50

Abstract: A disk drive comprises non-volatile rotatable media and a controller operatively coupled to the non-volatile rotatable media. The controller is configured to receive a series of host commands to be executed by the controller and generate a command execution sequence comprising the series of host commands. A task manager, integral or coupled to the controller, is configured to receive a plurality of background tasks comprising a least two priority background tasks to be executed by the controller along with execution of the series of host commands, and insert one or more of the at least two priority background tasks into the command execution sequence while maintaining a specified ratio of priority background task execution and host command execution substantially constant. The controller is configured to execute the command execution sequence with the one or more inserted priority background tasks.

公开(公告)号：US11081135B2

公开(公告)日：2021-08-03

申请号：US16653732

申请日：2019-10-15

Applicant: Seagate Technology LLC

Inventor： Jian Qiang ,  Xiong Liu ,  WenXiang Xie

IPC: G11B5/012 ,  G11B20/18 ,  G11B20/12 ,  G06F12/0875 ,  G06F12/0888 ,  G06F12/0871 ,  G11B20/10 ,  G06F12/0868

Abstract: The disclosed technology provides a method that improves CCT in SMR device systems. In one implementation, the method comprises writing data to a shingled magnetic recording (SMR) band in a storage device, determining whether an off-track write has occurred, identifying unsafe written data in response to determining that an off-track write has occurred, determining whether caching space is available upon identifying unsafe written data, continue writing data to the SMR band without a write retry upon determining that caching space is available, and writing unsafe written data to the available caching space. In another implementation, the method comprises receiving a request to repair an encroached track in an SMR band, recovering encroached data to a dynamic random-access memory, determining whether caching space is available, writing the recovered data to the available caching space upon determining that caching space is available, and merging other cached data in the SMR band.

公开(公告)号：US20210134331A1

公开(公告)日：2021-05-06

申请号：US16676091

申请日：2019-11-06

Applicant: Seagate Technology LLC

Inventor： Yichao Ma ,  Yimin Niu ,  Xiong Liu ,  Lionel Young

IPC: G11B33/14 ,  G11B25/04

Abstract: A hard disk drive includes a base deck and a load/unload ramp component. The base deck includes a floor and sidewalls. The load/unload ramp component is coupled to the floor of the base deck. At least one of the sidewalls includes an arcuate extension portion that extends to contact the load/unload ramp component.

公开(公告)号：US10896693B1

公开(公告)日：2021-01-19

申请号：US15454587

申请日：2017-03-09

Applicant: Seagate Technology LLC

Inventor： Lihong Zhang ,  Xiong Liu ,  Hongbo Wang ,  Xinwei Li

IPC: G11B5/73

Abstract: A stack comprises a substrate, a magnetic recording layer, and a negative thermal expansion layer disposed between the substrate and the magnetic recording layer. The negative thermal expansion layer is configured to reduce thermal profile changes of a surface of the stack opposite the substrate during a heat assisted magnetic recording write operation.

公开(公告)号：US10885932B1

公开(公告)日：2021-01-05

申请号：US16798739

申请日：2020-02-24

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Quan Li

IPC: G11B5/09 ,  G11B7/0045 ,  G11B5/39 ,  G11B20/10 ,  G11B5/00

Abstract: A heat-assisted magnetic recording device includes a write pole positionable adjacent a magnetic recording medium and configured to write data to the medium. A near-field transducer is situated proximate the write pole and configured to produce a thermal spot on the medium. A channel circuit is configured to generate a sequence of symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. A write driver is configured to apply bi-directional write currents to the write pole to record the sequence of symbols at a location of the thermal spot on the medium, wherein a duration of applying the write currents to the write pole by the write driver is dependent on a length of the sequence of symbols and the effective thermal spot size.

公开(公告)号：US20200090705A1

公开(公告)日：2020-03-19

申请号：US16694719

申请日：2019-11-25

Applicant: Seagate Technology LLC

Inventor： Jian Qiang ,  Xiong Liu ,  Choon Wei Ng ,  Sangyun Jung

IPC: G11B27/36 ,  G06F12/0871 ,  G11B20/12 ,  G11B20/10 ,  G06F3/06 ,  G11B5/012

Abstract: Methods and systems that reduce off-track write retry operations in shingled magnetic recording systems. In one implementation, the method includes writing data to an initial track, determining which side of the initial track is a shingled side, calculating a percentage of position error signal (PES) at a shingled side end of the initial track (PES1) when an off-track write operation occurs, determining whether the PES1 meets a first pre-determined threshold, continue writing data to a second track responsive to determining the PES1 is below a first pre-determined threshold, calculating a percentage of PES at a shingled side end of the second track (PES2), determining whether a combined value of PES1 and PES2 is above a second predetermined threshold to determine a probability value of the initial track being erased, and continue writing to a third track if the combined value is below the second predetermined threshold.

公开(公告)号：US10580468B2

公开(公告)日：2020-03-03

申请号：US15720115

申请日：2017-09-29

Applicant: Seagate Technology LLC

Inventor： Andrew Michael Kowles ,  Mark Gaertner ,  Xiong Liu ,  WenXiang Xie ,  Kai Yang ,  Jiangnan Lin

IPC: G06F12/00 ,  G11C7/22 ,  G11B5/31 ,  G11C11/409 ,  G06F12/0871 ,  G02B3/10

Abstract: In accordance with one implementation, a method for reducing cache service time includes determining an access time parameter associated with movement of a read/write head to an access location for each of a plurality of contiguous cache storage segments and dynamically selecting one of the plurality of contiguous cache storage segments to store data based on the determined access time parameter.

公开(公告)号：US10540110B2

公开(公告)日：2020-01-21

申请号：US15944235

申请日：2018-04-03

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Jiangnan Lin ,  WenXiang Xie

IPC: G06F12/00 ,  G06F3/06 ,  G06F12/10

Abstract: A data-storing method for accelerated read throughput of a channel received as part of a multi-channel data stream includes writing a first channel segment of the multi-channel data stream to a first continuous sequence of physical blocks along a first data track of a storage medium within a storage device and identifying a second channel segment of the multi-channel data stream as being a continuation of the first channel segment. The method further includes writing the second channel segment to a second continuous sequence of physical blocks along a second data track responsive to the identification, the second continuous sequence of physical blocks being offset from the first continuous sequence in a down-track direction by a minimum block offset, the minimum block offset representing at least a number of physical blocks on the storage medium that rotate below a read/write element of the storage device during a time that the read/write element is moved from the first data track to the second data track.

公开(公告)号：US10482912B1

公开(公告)日：2019-11-19

申请号：US16249438

申请日：2019-01-16

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Lihong Zhang ,  PengBoon Khoo

IPC: G11B5/09 ,  G11B5/596 ,  G11B20/10 ,  G11B5/00

Abstract: A magnetic recording medium includes a recording surface comprising a first recording layer having a first ferromagnetic resonant frequency and a second recording layer having a second ferromagnetic resonant frequency. The first recording layer is configured for storing user data and the second recording layer configured for storing servo data. A recording head arrangement is configured for microwave-assisted magnetic recording (MAMR) and writing user data to the first recording layer. The recording head arrangement comprises a write pole configured to generate a write magnetic field, and a write-assist arrangement proximate the write pole. The write-assist arrangement is configured to generate a radiofrequency assist magnetic field at a frequency that corresponds to the first ferromagnetic resonant frequency. A reader of the recording head arrangement is configured to read combined signals from the first and second recording layers.

公开(公告)号：US10460760B2

公开(公告)日：2019-10-29

申请号：US15656278

申请日：2017-07-21

Applicant: Seagate Technology LLC

Inventor： Jian Qiang ,  Xiong Liu ,  WenXiang Xie

IPC: G11B20/12 ,  G11B20/18 ,  G11B5/012 ,  G06F12/0875 ,  G11B20/10

Abstract: The disclosed technology provides a method that improves CCT in SMR device systems. In one implementation, the method comprises writing data to a shingled magnetic recording (SMR) band in a storage device, determining whether an off-track write has occurred, identifying unsafe written data in response to determining that an off-track write has occurred, determining whether caching space is available upon identifying unsafe written data, continue writing data to the SMR band without a write retry upon determining that caching space is available, and writing unsafe written data to the available caching space. In another implementation, the method comprises receiving a request to repair an encroached track in an SMR band, recovering encroached data to a dynamic random-access memory, determining whether caching space is available, writing the recovered data to the available caching space upon determining that caching space is available, and merging other cached data in the SMR band.