公开(公告)号：US10997996B1

公开(公告)日：2021-05-04

申请号：US16916786

申请日：2020-06-30

Applicant: Seagate Technology LLC

Inventor： Phan Linh Nguyen ,  Chi Sern Georgie Tan ,  Qiang Bi ,  Joshua W. Christensen ,  Song Wee Teo ,  Wei Chen Lau ,  Heather Lee Mallett ,  Renee Depew ,  David Allan Thorsvik ,  Tze Pin Chin ,  Jose Mari Toribio

IPC: G11B5/09 ,  G11B5/596 ,  G11B20/12 ,  G11B20/10 ,  G11B33/12

Abstract: The technology disclosed herein provides a method for generating an on-cylinder limit (OCLIM), the method including performing servo certification of a plurality of drives in a storage device to generate servo adaptive parameters (SAPs) by heads, generating a plurality of read adjust parameters (RAPs) by heads for the plurality of drives, generating an interim OCLIM value based on the SAPs by heads and RAPs by zones, and operating a disc drive write element using the interim OCLIM value.

公开(公告)号：US09093093B2

公开(公告)日：2015-07-28

申请号：US14063501

申请日：2013-10-25

Applicant: Seagate Technology LLC

Inventor： Subra Nagarajan ,  Joshua W. Christensen ,  Wei W. Zhao ,  Daniel D. Dittmer ,  Richard Garner Cox

IPC: G11B21/02 ,  G11B5/09 ,  G11B5/55 ,  G11B5/54 ,  G06F3/06

CPC classification number: G11B5/5526 ,  G06F3/06 ,  G06F3/0601 ,  G06F3/0676 ,  G06F2003/0695 ,  G11B5/012 ,  G11B5/09 ,  G11B5/54 ,  G11B5/5521 ,  G11B5/59633 ,  G11B20/1217 ,  G11B20/1258 ,  G11B20/1889 ,  G11B21/12

Abstract: An adaptive guard band scheme is disclosed for a data storage device. In illustrated embodiments, the adaptive guard band scheme formats different guard band cylinders and track zeros for different heads depending upon a contact cylinder of the different heads. In an illustrative embodiment, the adaptive guard band scheme utilizes the contact cylinders for the heads and a no fly cylinder to determine track zero(s) and extended data zone(s) for select heads.

Abstract translation: 公开了一种用于数据存储设备的自适应保护带方案。 在所示实施例中，自适应保护带方案根据不同头部的接触圆柱体对不同的头形成不同的保护带圆筒和轨迹零点。 在说明性实施例中，自适应保护带方案利用头部的接触圆柱体和无飞轮来确定用于选择头部的轨道零点和扩展数据区域。

公开(公告)号：US11380356B2

公开(公告)日：2022-07-05

申请号：US17218810

申请日：2021-03-31

Applicant: Seagate Technology LLC

Inventor： Phan Linh Nguyen ,  Chi Sern Georgie Tan ,  Qiang Bi ,  Joshua W. Christensen ,  Song Wee Teo ,  Wei Chen Lau ,  Heather Lee Mallett ,  Renee Depew ,  David Allan Thorsvik ,  Tze Pin Chin ,  Jose Mari Toribio

IPC: G11B5/09 ,  G11B5/596 ,  G11B20/12 ,  G11B20/10 ,  G11B33/12

Abstract: The technology disclosed herein provides a method for generating an on-cylinder limit (OCLIM), the method including performing servo certification of a plurality of drives in a storage device to generate servo adaptive parameters (SAPs) by heads, generating a plurality of read adjust parameters (RAPs) by heads for the plurality of drives, generating an interim OCLIM value based on the SAPs by heads and RAPs by zones, and operating a disc drive write element using the interim OCLIM value.

公开(公告)号：US20150116863A1

公开(公告)日：2015-04-30

申请号：US14063501

申请日：2013-10-25

Applicant: Seagate Technology LLC

Inventor： Subra A. Nagarajan ,  Joshua W. Christensen ,  Wei W. Zhao ,  Daniel D. Dittmer ,  Richard Garner Cox

IPC: G11B5/55

CPC classification number: G11B5/5526 ,  G06F3/06 ,  G06F3/0601 ,  G06F3/0676 ,  G06F2003/0695 ,  G11B5/012 ,  G11B5/09 ,  G11B5/54 ,  G11B5/5521 ,  G11B5/59633 ,  G11B20/1217 ,  G11B20/1258 ,  G11B20/1889 ,  G11B21/12

Abstract: An adaptive guard band scheme is disclosed for a data storage device. In illustrated embodiments, the adaptive guard band scheme formats different guard band cylinders and track zeros for different heads depending upon a contact cylinder of the different heads. In an illustrative embodiment, the adaptive guard band scheme utilizes the contact cylinders for the heads and a no fly cylinder to determine track zero(s) and extended data zone(s) for select heads.

Abstract translation: 公开了一种用于数据存储设备的自适应保护带方案。 在所示实施例中，自适应保护带方案根据不同头部的接触圆柱体对不同的头形成不同的保护带圆筒和轨迹零点。 在说明性实施例中，自适应保护带方案利用头部的接触圆柱体和无飞轮来确定用于选择头部的轨道零点和扩展数据区域。

公开(公告)号：US11074933B1

公开(公告)日：2021-07-27

申请号：US17017909

申请日：2020-09-11

Applicant: Seagate Technology LLC

Inventor： Riyan A. Mendonsa ,  Mehmet F. Erden ,  Joshua W. Christensen

IPC: G11B20/12 ,  G11B5/596 ,  G11B5/012

Abstract: A hard disk drive includes a magnetic writer and a magnetic recording medium, which includes data tracks with user data sections positioned between servo wedges. The servo wedges each can include multiple servo sectors. The hard disk drive also includes circuitry programmed to cause the magnetic writer to write user data to the multiple servo sectors in multiple servo wedges.

公开(公告)号：US09875763B1

公开(公告)日：2018-01-23

申请号：US15332475

申请日：2016-10-24

Applicant: Seagate Technology LLC

Inventor： Jason C. Jury ,  Siong Liu ,  Joshua W. Christensen

IPC: G11B5/596 ,  G11B20/18 ,  G11B20/12

CPC classification number: G11B5/59627 ,  G11B5/59688 ,  G11B20/1816 ,  G11B2020/183

Abstract: Method and apparatus for recovering user data from a rotatable data recording medium. In some embodiments, a moveable read element detects at least one uncorrectable read error in user data stored in a data sector arranged along a concentric track. A read retry operation is carried out to recover the user data by radially advancing the moveable read element from a first offset value to a different second offset value with respect to the track in accordance with a trajectory profile while transducing the user data from the data sector. This allows data that are variably overwritten (encroached upon) by different radial amounts from an adjacent track to be recovered.

公开(公告)号：US09070411B1

公开(公告)日：2015-06-30

申请号：US13935545

申请日：2013-07-04

Applicant: Seagate Technology LLC

Inventor： Timothy Ellis ,  Joshua W. Christensen ,  Ravi Hebbar ,  John Purkett ,  Justin Won

IPC: G11B5/09 ,  G11B20/14 ,  G11B5/596 ,  G11B20/12

CPC classification number: G11B5/59633 ,  G11B5/59627 ,  G11B5/59655 ,  G11B5/59661 ,  G11B20/10222 ,  G11B2020/1287

Abstract: Systems and methods are disclosed for writable servo zone overlap regions on a disc memory. An apparatus may comprise a controller configured to determine a servo gate (sgate) timing for an overlap zone including servo patterns of a first servo super zone and a second servo super zone of a disc memory, the sgate timing based on servo pattern timing for the first servo super zone and the second servo super zone. The controller may initiate writing to the overlap zone based on the sgate timing. The controller may also reduce the impact of servo pattern frequency change between zones by calculating a trajectory error prior to the crossing, and providing 1/X of the trajectory error into a servo feedback loop for a following X servo sampling points.

Abstract translation: 公开了用于盘存储器上的可写伺服区重叠区域的系统和方法。 装置可以包括：控制器，被配置为确定包括盘存储器的第一伺服超级区域和第二伺服超级区域的伺服模式的重叠区域的伺服门（sgate）定时，基于伺服模式定时 第一伺服超级区和第二伺服超区。 控制器可以基于sgate定时开始写入重叠区域。 控制器还可以通过计算交叉之前的轨迹误差来减小区域之间的伺服模式频率变化的影响，并且将轨迹误差的1 / X提供给用于后续X伺服采样点的伺服反馈回路。