公开(公告)号：US20220035536A1

公开(公告)日：2022-02-03

申请号：US16943898

申请日：2020-07-30

Applicant: Seagate Technology LLC

Inventor： Xiong LIU ,  WenXiang XIE ,  Jian QIANG

IPC: G06F3/06 ,  G11B5/596

Abstract: The technology disclosed herein pertains to a method for determining expected command completion time (CCT), the method including receiving a plurality of position error signals (PESs) for an HDD over a predetermined time period, determining sigma of the plurality of PESs, retrieving upper off-track limits (UOL) for one or more data sectors of the HDD, calculating average number of retrieved sectors (A) between two consecutive occurrences of the |PES|>UOL for the HDD, and determining required number of revolutions (CCT) to collect data based on the average number of retrieved data sectors (A) and a total number of requested data sectors (N).

公开(公告)号：US20220291844A1

公开(公告)日：2022-09-15

申请号：US17828727

申请日：2022-05-31

Applicant: Seagate Technology LLC

Inventor： Xiong LIU ,  WenXiang XIE

IPC: G06F3/06 ,  G11B5/596

Abstract: The technology disclosed herein pertains to a method for determining expected command completion time (CCT), the method including receiving a plurality of position error signals (PESs) for an HDD over a predetermined time period, determining sigma of the plurality of PESs, retrieving upper off-track limits (UOL) for one or more data sectors of the HDD, calculating average number of retrieved sectors (A) between two consecutive occurrences of the |PES|>UOL for the HDD, and determining required number of revolutions (CCT) to collect data based on the average number of retrieved data sectors (A) and a total number of requested data sectors (N).

公开(公告)号：US20190235840A1

公开(公告)日：2019-08-01

申请号：US15884952

申请日：2018-01-31

Applicant: Seagate Technology LLC

Inventor： Li Hong ZHANG ,  WenXiang XIE ,  Xiong LIU

IPC: G06F7/58 ,  G11B7/13

Abstract: A method includes detecting noise in a laser output of a heat assisted magnetic recording device. The noise is converted into an electrical signal including a numerical value. A least significant digit of the numerical value is selected. The least significant digit is concatenated with another least significant digit from another detecting of another noise in another laser output to form a number.

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：US20200043526A1

公开(公告)日：2020-02-06

申请号：US16653732

申请日：2019-10-15

Applicant: Seagate Technology LLC

Inventor： Jian QIANG ,  Xiong LIU ,  WenXiang XIE

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