公开(公告)号：US20240087598A1

公开(公告)日：2024-03-14

申请号：US18223896

申请日：2023-07-19

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Lihong Zhang ,  Quan Li ,  Wenxiang Xie

IPC: G11B5/265 ,  G11B5/55

CPC classification number: G11B5/2654 ,  G11B5/5547

Abstract: A method involves determining a threshold error rate that will result on data stored on a magnetic disk surface of a disk drive being unrecoverable. The method also involves determining a seek velocity that will overwrite sufficient portions of the data such the data will exhibit at least the threshold error rate. The disk drive performs at least one traversal of the magnetic disk surface with a head of the disk drive that emits an erase field during the at least one traversal at the seek velocity. The at least one traversal sanitizes the data.

公开(公告)号：US11631424B1

公开(公告)日：2023-04-18

申请号：US17686064

申请日：2022-03-03

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Quan Li

IPC: G11B5/008 ,  G11B27/36 ,  G11B5/012

Abstract: The technology disclosed herein provides a method including determining an acceptable parameter rate for a dual reader storage device having dual readers, identifying one of the dual readers as the preferable reader, comparing an actual parameter rate of the storage device to the acceptable parameter rate of the storage device, and in response to determining that the actual parameter rate is below the acceptable parameter rate, operating the storage device using only the preferable reader. In one implementation, the parameter rate is bit-error rate (BER) of the dual readers.

公开(公告)号：US20190250887A1

公开(公告)日：2019-08-15

申请号：US15894116

申请日：2018-02-12

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Lihong Zhang ,  WenXiang Xie ,  Quan Li

IPC: G06F7/58

Abstract: Apparatuses and methods disclosed herein relate to detecting a signal generated by a spin torque oscillator (STO). The signal is outputted, wherein the signal includes a direct current (DC) component, a wide bandwidth noise component, and an STO oscillating radio frequency (RF) component. The signal is filtered, wherein the filtering removes the DC component and the STO oscillating RF component, leaving the wide bandwidth noise component. A value of the wide bandwidth noise component is converted into a binary value, and a bit from the binary value is selected and combined with another bit to form a random number.

公开(公告)号：US10192580B1

公开(公告)日：2019-01-29

申请号：US15971284

申请日：2018-05-04

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Quan Li ,  Ralph William Cross

IPC: G11B15/02 ,  G11B11/105 ,  G11B20/10 ,  G11B5/09 ,  G11B5/012

Abstract: A sequence of symbols is generated to describe a set of write data, the symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. Bi-directional write currents are applied to a write pole to record the sequence of symbols to a magnetic storage medium. The write pole has an effective footprint with a downtrack length of mT, where m is an integer. The write currents are switched between a first rail current and a second rail current for alternating symbols, the write currents further transitioning to an intermediate current value for at least one channel clock period for symbols longer than 1T. Write currents are applied to the write pole when recording symbols having a length longer than mT using the effective footprint of the write pole as an interval.

公开(公告)号：US09875757B1

公开(公告)日：2018-01-23

申请号：US15347111

申请日：2016-11-09

Applicant: Seagate Technology LLC

Inventor： Xiong Liu ,  Quan Li

IPC: G11B5/09 ,  G11B5/17 ,  G11B20/12

CPC classification number: G11B5/09 ,  G11B5/17 ,  G11B20/10481 ,  G11B2020/1238

Abstract: An offset from track center of a writer that is writing to a track of a magnetic recording medium is determined. A write current applied to a write coil of the writer is adjusted to compensate for the offset. The adjusting of the write current affects a width of the track.