公开(公告)号：US09824699B1

公开(公告)日：2017-11-21

申请号：US15420468

申请日：2017-01-31

Applicant: Seagate Technology LLC

Inventor： Huazhou Lou ,  Jason W. Riddering ,  Richard Edward Martin ,  Michael P. DeFeo

IPC: G11B11/00 ,  G11B5/09 ,  G11B5/00 ,  G11B11/105 ,  G11B5/60 ,  G11B7/126 ,  G11B5/58

CPC classification number: G11B5/09 ,  G11B5/58 ,  G11B5/6005 ,  G11B5/6088 ,  G11B7/126 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

Abstract: A lumped-parameter function δ is determined that represents an average power dissipated by a write transducer when writing a signal to a magnetic recording medium. Temperatures of the write transducer are measured while varying the parameters to determine constants of the function δ. The function δ is used to adjust power applied to a clearance control heater when writing to the magnetic recording medium.

公开(公告)号：US09595279B1

公开(公告)日：2017-03-14

申请号：US14925105

申请日：2015-10-28

Applicant: Seagate Technology LLC

Inventor： Richard Edward Martin

IPC: G11B21/02 ,  G11B5/60

CPC classification number: G11B5/6029 ,  G11B5/607

Abstract: A reference track written to a magnetic recording medium includes at least two harmonics that facilitate measuring a clearance between a read/write head and the recording medium. A magnetic field is applied to the reference track that accelerates a thermal decay of the reference track without erasing data of the reference track.

Abstract translation: 写入磁记录介质的参考轨道包括至少两个谐波，其便于测量读/写头与记录介质之间的间隙。 将磁场施加到参考轨道，加速参考轨道的热衰减，而不擦除参考轨道的数据。

公开(公告)号：US09595278B1

公开(公告)日：2017-03-14

申请号：US14925087

申请日：2015-10-28

Applicant: Seagate Technology LLC

Inventor： Richard Edward Martin

IPC: G11B21/02 ,  G11B5/60 ,  G11B20/18

CPC classification number: G11B5/6029

Abstract: A test track is written to a recording medium and includes a repeated series of reference patterns. The reference patterns each include a first portion with a high frequency pure tone and a second portion with a higher frequency component. A length of the first portion is greater than a length of the second portion. The series of reference patterns are read to determine first and second harmonic amplitudes, and a head-to-media clearance is determined based on the first and second amplitudes at first and second harmonic frequencies.

Abstract translation: 将测试轨迹写入记录介质并且包括重复的一系列参考图案。 参考图案各自包括具有高频纯音的第一部分和具有较高频率分量的第二部分。 第一部分的长度大于第二部分的长度。 读取一系列参考图案以确定第一和第二谐波幅度，并且基于第一和第二谐波频率处的第一和第二幅度来确定头对媒体间隙。