公开(公告)号：US09589588B2

公开(公告)日：2017-03-07

申请号：US15149361

申请日：2016-05-09

申请人： Seagate Technology LLC

发明人： Kangkang Wang ,  Xiaobin Zhu ,  Ganping Ju ,  Kai Chieh Chang ,  Yingguo Peng ,  Timothy J. Klemmer ,  Jan-Ulrich Thiele

IPC分类号： G11B7/12 ,  G11B7/1267 ,  G11B5/024 ,  G11B5/00 ,  G11B27/36

CPC分类号： G11B7/1267 ,  G01R33/0325 ,  G11B5/024 ,  G11B5/4555 ,  G11B27/36 ,  G11B2005/0021

摘要： An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to measure one or more magnetic properties of the track using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.

摘要翻译： 一种装置包括用于旋转磁记录介质的主轴和磁场发生器，以将介质的轨道暴露于DC磁场。 磁场发生器被配置为在擦除模式期间使轨道饱和，并在写入模式期间逆转撞击轨道的直流磁场。 激光装置在擦除模式期间加热轨道，并且在写入模式期间，加热轨道，同时轨道暴露于反向的DC磁场，以便在其上写入磁性图案。 读取器读取磁性图案并产生读取信号。 处理器耦合到读取器并且被配置为使用读取信号来测量轨道的一个或多个磁性。 该装置还可以包括使用磁图案产生克尔信号的克尔传感器。

公开(公告)号：US20160307588A1

公开(公告)日：2016-10-20

申请号：US15081495

申请日：2016-03-25

申请人： Guzik Technical Enterprises

发明人： Nahum Guzik ,  Konstantin Perevoztchikov ,  Vladislav Klimov ,  Wei Zhuang

IPC分类号： G11B5/455 ,  G01R33/12

CPC分类号： G11B5/4555 ,  G01R33/12 ,  G01R33/1207 ,  G10H1/005 ,  Y10T29/4902 ,  Y10T29/49021

摘要： An HGA loader provides HGAs, in succession, to a multiple workstation head tester. An HGAs carrier station receives HGAs to be tested. An alignment station on the base includes an alignment surface which selectively rotates about an alignment axis. A camera generates images of an HGA on the alignment surface, which is rotated so that the HGA has a desired spatial orientation which is maintained as the HGA is transferred to an HGA testing workstation. A received, oriented HGA is positioned to enable read/write test operations on a disk rotating on an adjacent spinstand. To effect the successive position operations, a transporter includes a track overlying the workstations, and a carriage movable along the track, to pass from workstation to workstations. The loader is automatically operative under the control of a controller.

摘要翻译： HGA加载器连续向多台工作站头测试仪提供HGA。 HGA载波台接收待测试的HGA。 基座上的对准台包括一对准表面，该对准表面围绕对准轴线选择性旋转。 相机在对准表面上产生HGA的图像，其被旋转，使得HGA具有期望的空间取向，当HGA被传送到HGA测试工作站时保持。 接收到的面向定位的HGA被定位成对在相邻的纺锤台上旋转的盘进行读/写测试操作。 为了实现连续的位置操作，传送器包括覆盖工作站的轨道以及沿着轨道移动的托架，以从工作站传送到工作站。 装载机在控制器的控制下自动运行。

公开(公告)号：US09336832B1

公开(公告)日：2016-05-10

申请号：US14720250

申请日：2015-05-22

申请人： Seagate Technology LLC

发明人： Kangkang Wang ,  Xiaobin Zhu ,  Ganping Ju ,  Kai Chieh Chang ,  Yingguo Peng ,  Timothy J. Klemmer ,  Jan-Ulrich Thiele

IPC分类号： G11B11/00 ,  G11B27/36 ,  G11B5/024 ,  G11B5/09 ,  G11B5/00

CPC分类号： G11B7/1267 ,  G01R33/0325 ,  G11B5/024 ,  G11B5/4555 ,  G11B27/36 ,  G11B2005/0021

摘要： An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to measure one or more magnetic properties of the track using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.

摘要翻译： 一种装置包括用于旋转磁记录介质的主轴和磁场发生器，以将介质的轨道暴露于DC磁场。 磁场发生器被配置为在擦除模式期间使轨道饱和，并在写入模式期间逆转撞击轨道的直流磁场。 激光装置在擦除模式期间加热轨道，并且在写入模式期间，加热轨道，同时轨道暴露于反向的DC磁场，以便在其上写入磁性图案。 读取器读取磁性图案并产生读取信号。 处理器耦合到读取器并且被配置为使用读取信号来测量轨道的一个或多个磁性。 该装置还可以包括使用磁图案产生克尔信号的克尔传感器。

公开(公告)号：US09183859B1

公开(公告)日：2015-11-10

申请号：US14538676

申请日：2014-11-11

申请人： Western Digital (Fremont), LLC

发明人： Michael Alex ,  Bogdan F. Valcu ,  David E. Wachenschwanz ,  Andreas Moser

IPC分类号： G11B11/00 ,  G11B5/455 ,  G11B5/00

CPC分类号： G11B5/455 ,  G11B5/4555 ,  G11B2005/0021

摘要： The present disclosure generally relates to a HAMR head and techniques and apparatus for HAMR writer pole length characterization. One or more bits may be magnetically written on a disk using a leading edge of the writer pole at a first polarity. The disk may be moved under a body of the writer pole to magnetically write the one or more bits in the disk at a second polarity that is opposite to the first polarity to generate a feedback pulse having a signal amplitude. The signal amplitude of the feedback pulse may be measured as a function of writing frequency. A first effective length of the writer pole may be determined based on the measurements.

摘要翻译： 本公开一般涉及HAMR头和用于HAMR写入器极长度表征的技术和装置。 可以使用第一极性的写入器极的前沿将一个或多个位磁性写入盘上。 磁盘可以在写入极的主体之下移动，以与第一极性相反的第二极性磁盘地写入盘中的一个或多个位，以产生具有信号幅度的反馈脉冲。 反馈脉冲的信号幅度可以作为写入频率的函数来测量。 可以基于测量来确定写入极的第一有效长度。

公开(公告)号：US09165577B2

公开(公告)日：2015-10-20

申请号：US14198501

申请日：2014-03-05

申请人： Seagate Technology LLC

发明人： Dale E. Kukacka ,  David G. Wobbe ,  Timothy Edward Langlais ,  ReAnn Dargus Robelia

IPC分类号： G11B5/48 ,  G11B5/455

CPC分类号： G11B5/4555 ,  G11B5/4873

摘要： Provided herein is an apparatus, including a spinstand configured to position a disk in a testing orientation and a motor coupled to the spinstand, configured to rotate the disk. The motor comprises a fluid dynamic bearing.

摘要翻译： 本文提供了一种装置，其包括构造成将盘定位在测试方向上的纺锤架和耦合到纺锤台的马达，其配置成旋转盘。 马达包括流体动力轴承。

公开(公告)号：US08885275B1

公开(公告)日：2014-11-11

申请号：US14133075

申请日：2013-12-18

申请人： HGST Netherlands B.V.

发明人： Jing Lou ,  Alexander Taratorin

IPC分类号： G11B27/36 ,  G11B5/09

CPC分类号： G11B5/4555 ,  G11B5/09 ,  G11B20/10305

摘要： A system detects adjacent track interference (ATI)/far track interference (FTI) in a data storage system. The system includes a micro-transition generator that introduces micro-transitions into data write patterns written to a magnetic media. A spectrum analyzer analyzes in the frequency domain read-back signals generated in response to the data write patterns. In particular, the spectrum analyzer calculates first and second signal-to-noise ratios (SNRs) based on read-back signals generated before and after a center track stress test. Adjacent track interference/far track interference effects are determined based on the first and second SNR values.

摘要翻译： 系统检测数据存储系统中的相邻轨道干扰（ATI）/远距离干扰（FTI）。 该系统包括微转换发生器，其将微转换引入写入磁介质的数据写入模式。 频谱分析仪分析响应于数据写入模式产生的频域读回信号。 特别地，频谱分析仪基于在中心轨道应力测试之前和之后产生的回读信号来计算第一和第二信噪比（SNR）。 基于第一和第二SNR值来确定相邻轨道干扰/远距离干扰效应。

公开(公告)号：US20140254341A1

公开(公告)日：2014-09-11

申请号：US13790820

申请日：2013-03-08

申请人： SEAGATE TECHNOLOGY LLC

发明人： Huazhou Lou ,  Lin Zhou

IPC分类号： G11B27/36

CPC分类号： G11B27/36 ,  G11B5/4555 ,  G11B5/6058 ,  G11B5/607 ,  G11B5/6076

摘要： The application discloses a sensor device to measure friction force at a head-media interface. As disclosed, the sensor device has a transducer element oriented to provide an electrical output responsive to force or strain imparted to the transducer element along an in-plane axis. Sensor circuitry is coupled to the transducer element to process the electrical output to provide an output measure of friction force. In illustrated embodiments, the head includes an actuator element which is powered on/off at an on/off frequency to cyclically protrude a localized portion of the head. The on/off frequency of the actuator is used by the sensor circuitry to detect excitation of the sensor device due to friction force at the head-media interface.

摘要翻译： 本申请公开了一种用于测量头部 - 媒体界面上的摩擦力的传感器装置。 如所公开的，传感器装置具有换向器元件，该换能器元件被定向成响应于沿着平面内轴线传递给换能器元件的力或应变来提供电输出。 传感器电路耦合到换能器元件以处理电输出以提供摩擦力的输出量度。 在所示的实施例中，头部包括致动器元件，该致动器元件在开/关频率上通电/断开以循环地突出头部的局部部分。 致动器的开/关频率由传感器电路用于由于头 - 媒体界面处的摩擦力来检测传感器装置的激励。

公开(公告)号：US08611048B2

公开(公告)日：2013-12-17

申请号：US13263042

申请日：2010-04-27

申请人： Keith Rowland Charles Brady ,  Graham Collins

发明人： Keith Rowland Charles Brady ,  Graham Collins

IPC分类号： G11B15/10 ,  G01R33/00

CPC分类号： G11B5/455 ,  G11B5/4555

摘要： An apparatus for receiving and positioning a read/write head to a disk and related methods are disclosed. The apparatus includes: a deck; a spindle on the deck; a safety enclosure surrounding at least the spindle; and a movable carriage having at least one head receiving portion. The carriage is movable between a first position wherein the head receiving portion is outside the safety enclosure and a second position wherein the head receiving portion is inside the safety enclosure. The apparatus further includes an automated mechanism arranged to pick up the head from the head receiving portion when in the second position and to load the head to the disk for testing.

摘要翻译： 公开了一种用于接收和定位读/写磁头到磁盘的装置和相关方法。 该装置包括：甲板; 甲板上的主轴; 至少围绕主轴的安全壳; 以及具有至少一个头部接收部分的可动托架。 滑架可在第一位置和第二位置之间移动，第一位置是头部接收部分位于安全外壳之外，其中头部接收部分位于安全外壳内。 该装置还包括一个自动化机构，被设置成当处于第二位置时从头部接收部分拾取头部并将头部装载到盘上进行测试。

公开(公告)号：US20130250446A1

公开(公告)日：2013-09-26

申请号：US13424640

申请日：2012-03-20

申请人： Qinghua Zeng ,  Ellis Cha

发明人： Qinghua Zeng ,  Ellis Cha

IPC分类号： G11B21/12 ,  G11B5/09

CPC分类号： G11B5/607 ,  G11B5/4555 ,  G11B5/6076

摘要： A method to compensate for spacing variations between a dynamic fly height (DFH) controlled read/write head and a rotating disk surface. Using a HDI sensor or equivalent indicator of touchdowns, a power profile is calculated for an arbitrary track on a disk. The profile tracks disk topography by recording touchdown power at each of a series of sectors into which the track is subdivided. The resulting power profile, smoothed and expressed as a function of sector position, substitutes for the usual constant TD power setting that provides only an uncompensated range of spacing variations. A fixed back-off spacing power is added to the power profile enabling the head to fly over the track at a constant spacing. The power profile can be calculated to account for various temperature and pressure conditions.

摘要翻译： 一种用于补偿动态飞行高度（DFH）控制的读/写头和旋转盘表面之间的间距变化的方法。 使用HDI传感器或触地得分的等效指示符，计算磁盘上任意轨道的功率曲线。 轮廓通过在轨道被细分的一系列扇区中的每一个记录触地功率来跟踪盘形地形。 所得到的功率曲线，平滑并且表示为扇区位置的函数，代替通常的恒定TD功率设置，其仅提供无补偿的间隔变化范围。 固定的后退间距功率被添加到功率轮廓中，使得头以恒定的间距飞越轨道。 功率曲线可以计算出各种温度和压力条件。

公开(公告)号：US20130094110A1

公开(公告)日：2013-04-18

申请号：US13273428

申请日：2011-10-14

申请人： MARK S. SEYMOUR ,  MITCHELL D. DOUGHERTY ,  WALTER G. BANSHAK, JR. ,  GEOFFREY A. HALES

发明人： MARK S. SEYMOUR ,  MITCHELL D. DOUGHERTY ,  WALTER G. BANSHAK, JR. ,  GEOFFREY A. HALES

IPC分类号： G11B5/56

CPC分类号： G11B21/26 ,  G11B5/4555 ,  G11B5/4813 ,  G11B5/4833 ,  G11B21/21 ,  Y10T29/49025

摘要： A suspension clamp is disclosed for clamping a disk drive suspension to an actuator arm. The suspension clamp comprises a housing including a spring operable to bias a latching member, wherein the latching member is rotatable about a pivot. After compressing the spring and rotating the latching member in a first direction, the latching member is operable to clamp the suspension to the actuator arm by decompressing the spring.

摘要翻译： 公开了用于将盘驱动器悬架夹紧到致动器臂的悬架夹。 悬挂夹具包括壳体，其包括可操作以偏压闩锁构件的弹簧，其中闩锁构件可围绕枢轴旋转。 在压缩弹簧并沿着第一方向旋转闩锁构件之后，闩锁构件可操作以通过减压弹簧将悬架夹紧到致动器臂。