公开(公告)号：US20170352371A1

公开(公告)日：2017-12-07

申请号：US15341246

申请日：2016-11-02

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Mingzhong DING ,  Xiong LIU ,  Xiang LU ,  Qiang BI ,  Kian Keong OOI

IPC: G11B5/596

CPC classification number: G11B5/59627 ,  G11B5/59694

Abstract: Systems and methods for compensating for magnetoresistive (MR) jog offset direct current (DC) drift in a disc drive are described. In one embodiment, a method may include determining an occurrence of NOS, for example, by monitoring disc slip, to determine when the method should proceed. An MR jog offset DC drift amount is determined for each head of the disc drive. One of several approaches may be employed for determining the MR jog offset DC drift amount. By determining an MR jog offset DC drift amount for each head, a compensation profile is determined for the drive. The determined compensation profile may then be used during operation of the disc drive to compensate for the DC drift. One of several approaches may be employed for compensating based on the compensation profile.

公开(公告)号：US20220223177A1

公开(公告)日：2022-07-14

申请号：US17583558

申请日：2022-01-25

Applicant: Seagate Technology LLC

Inventor： Qiang BI ,  Jian QIANG ,  WenXiang XIE

IPC: G11B20/18 ,  G11B20/10

Abstract: The technology disclosed herein pertains to a system and method for managing write failures in a disc drive. Implementations disclosed herein provide a method including monitoring write fault events per sector for a storage device, in response to a write fault event, updating a write fault repeat count table, wherein the repeat count table tracks a number of write fault repeat counts per sector, comparing a write fault repeat count for a sector to a predetermined threshold write fault repeat count, and in response to determining that the write fault repeat count for a sector is above the predetermined threshold write fault repeat count, performing a write-reassign operation.

公开(公告)号：US20210407539A1

公开(公告)日：2021-12-30

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: G11B5/596 ,  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：US20180033457A1

公开(公告)日：2018-02-01

申请号：US15727399

申请日：2017-10-06

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Mingzhong DING ,  Xiong LIU ,  Xiang LU ,  Qiang BI ,  Kian Keong OOI

IPC: G11B5/596

CPC classification number: G11B5/59627 ,  G11B5/59694

Abstract: Systems and methods for compensating for magnetoresistive (MR) jog offset direct current (DC) drift in a disc drive are described. In one embodiment, a method may include determining an occurrence of NOS, for example, by monitoring disc slip, to determine when the method should proceed. An MR jog offset DC drift amount is determined for each head of the disc drive. One of several approaches may be employed for determining the MR jog offset DC drift amount. By determining an MR jog offset DC drift amount for each head, a compensation profile is determined for the drive. The determined compensation profile may then be used during operation of the disc drive to compensate for the DC drift. One of several approaches may be employed for compensating based on the compensation profile.