公开(公告)号：US20150255110A1

公开(公告)日：2015-09-10

申请号：US14552559

申请日：2014-11-25

Applicant: International Business Machines Corporation

Inventor： Robert G. Biskeborn ,  Calvin S. Lo ,  Tak H. Wong ,  Xu Yan

IPC: G11B20/10 ,  G11B5/58 ,  G11B27/36

CPC classification number: G11B5/60 ,  G11B5/00813 ,  G11B5/02 ,  G11B5/455 ,  G11B5/581 ,  G11B20/10305 ,  G11B20/10388 ,  G11B20/10472 ,  G11B20/18 ,  G11B27/36

Abstract: A supplemental module that includes one or more read elements periodically engages a magnetic recording medium, and the read elements generate an electrical signal corresponding to transitions written to the magnetic recording medium by a write element. A computer receives information representative of the electrical signal and determines if a quality metric of the magnetic recording medium derived from the electrical signal is within a defined range. If the quality metric is not within the defined range, a defined action is performed by the computer.

Abstract translation: 包括一个或多个读取元件的补充模块周期性地接合磁记录介质，并且读取元件产生对应于由写入元件写入到磁记录介质的转变的电信号。 计算机接收表示电信号的信息，并确定从电信号导出的磁记录介质的质量度量是否在限定范围内。 如果质量度量不在定义的范围内，则由计算机执行定义的动作。

公开(公告)号：US09111561B1

公开(公告)日：2015-08-18

申请号：US14526336

申请日：2014-10-28

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Samir Y. Garzon ,  Weldon Mark Hanson ,  Rehan Ahmed Zakai

IPC: G11B5/03 ,  G11B5/596

CPC classification number: G11B5/59616 ,  G11B5/02 ,  G11B20/10018

Abstract: A disk drive dynamic wave shaper (DWS) write driver includes a write current generator that produces a baseline output current for the write current pulses and an overshoot current generator that produces an overshoot current with different values. The overshoot current is added to the baseline current, with the value of the overshoot current amplitude (OSA) being selected in response to the frequency of transitions in the write data signal. The write driver includes logic circuitry that detects the pattern of transitions. Transitions that are immediately followed by a transition will receive a larger-than-nominal OSA1, transitions that are not immediately followed by a transition and that are not preceded by a long sequence of non-transitions will receive a nominal OSA2, and transitions after longer sequences of non-transitions will receive a smaller-than-nominal OSA3.

Abstract translation: 磁盘驱动器动态波形整形器（DWS）写入驱动器包括写入电流发生器，其产生写入电流脉冲的基线输出电流和产生具有不同值的过冲电流的过冲电流发生器。 过冲电流被加到基线电流上，响应于写入数据信号中的转换频率来选择过冲电流幅度（OSA）的值。 写驱动器包括检测转换模式的逻辑电路。 紧随其后的转换将接收到大于标称的OSA1，不是紧随其后的过渡的转换，而不是长时间的非转换序列将接收标称的OSA2，并且在更长时间后转换 非转换序列将接收到小于标称的OSA3。

公开(公告)号：US09099155B1

公开(公告)日：2015-08-04

申请号：US14448844

申请日：2014-07-31

Applicant: Seagate Technology LLC

Inventor： Abhay Kataria ,  Michael D. Schaff ,  Sandeep Bhushan ,  Kevin M. Bailey ,  Phillip Kevin McGinnis ,  Mai Ghaly

IPC: G11B27/36 ,  G11B5/09 ,  G11B20/10 ,  G11B5/02 ,  G11B5/55 ,  G11B20/18

CPC classification number: G11B20/18 ,  G11B5/02 ,  G11B5/5565 ,  G11B20/10009 ,  G11B27/36

Abstract: Apparatus and method for adaptively mitigating adjacent track interference (ATI) effects on a data recording medium. In some embodiments, a write count value is accumulated for a first track responsive to successive writes to a second track on the data recording medium. For each of the successive writes, the accumulated write count value for the first track is incremented by a different variable amount based on temperature. The first track is refreshed responsive to the accumulated write count reaching a selected threshold value.

Abstract translation: 用于自适应地减轻对数据记录介质的相邻轨道干扰（ATI）影响的装置和方法。 在一些实施例中，响应于对数据记录介质上的第二磁道的连续写入，针对第一磁道累积写入计数值。 对于每个连续写入，基于温度，第一轨道的累积写入计数值增加不同的可变量。 响应于达到所选择的阈值的累积写入次数来刷新第一轨道。

公开(公告)号：US09099127B1

公开(公告)日：2015-08-04

申请号：US14292749

申请日：2014-05-30

Applicant: HGST Netherlands B. V.

Inventor： Taku Shintani ,  Yohji Maruyama ,  Kouichi Nishioka ,  Masafumi Mochizuki

IPC: G11B5/39 ,  G11B5/02

CPC classification number: G11B5/3945 ,  G11B5/02 ,  G11B5/265 ,  G11B5/3163 ,  G11B5/3954 ,  G11B5/3974 ,  G11B5/4886

Abstract: A magnetic read head and associated circuitry for reducing side track noise and decreasing read width, thereby providing increased data density. The magnetic read head includes first and second sensor elements that are aligned with one another in a data track direction, with the first sensor element being wider than the second sensor element. Electrical circuitry is connected with the read head in such a manner as to read a first signal from the first sensor element and a second signal from a second sensor element. Because the second sensor element is wider than the first sensor element, it will read more side signal noise from adjacent data tracks than will the second sensor element. The circuitry connected with the first and second sensor element detects and distinguishes the side signal noise and separates it out from the data signal, based sensor width difference and location difference.

Abstract translation: 磁读头和相关电路，用于减少侧轨噪声和减小读宽，从而提高数据密度。 磁读头包括在数据轨道方向上彼此对准的第一和第二传感器元件，其中第一传感器元件比第二传感器元件宽。 电路与读头连接，以便从第一传感器元件读取第一信号和从第二传感器元件读取第二信号。 由于第二传感器元件比第一传感器元件更宽，因此它将从第二传感器元件读出相邻数据轨道的更多侧信号噪声。 与第一和第二传感器元件连接的电路检测和区分侧信号噪声，并根据传感器宽度差和位置差将其与数据信号分离。

公开(公告)号：US20150213813A1

公开(公告)日：2015-07-30

申请号：US14168970

申请日：2014-01-30

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Todd Michael Lammers ,  Housan Dakroub ,  Jason C. Jury

IPC: G11B5/027

CPC classification number: G11B20/10018 ,  G11B5/02

Abstract: The implementations disclosed herein provide for a storage device including a preamplifier that dynamically adjusts at least one of a rise time and fall time of an analog write current pulse based on a length of a corresponding write transition and/or characteristics of a media location where the write transition is to be recorded.

Abstract translation: 本文公开的实现方案提供了一种存储设备，其包括前置放大器，其基于相应写入转变的长度和/或媒体位置的特性动态地调整模拟写入电流脉冲的上升时间和下降时间中的至少一个，其中 写入转换将被记录。

公开(公告)号：US09093085B1

公开(公告)日：2015-07-28

申请号：US14336610

申请日：2014-07-21

Applicant: Kabushiki Kaisha Toshiba

Inventor： Hiroshi Isokawa

IPC: G11B11/00 ,  G11B7/1263 ,  G11B11/105

CPC classification number: G11B11/10595 ,  G11B5/02 ,  G11B11/10506 ,  G11B11/1053 ,  G11B2005/0021

Abstract: According to one embodiment, there is provided a magnetic disk device including a light source, a light irradiation element, and a controller. The light irradiation element is configured to receive light from the light source to irradiate light onto a magnetic disk. The controller is configured to switch between a first control and a second control according to a pulse width of data to be written onto the magnetic disk. The first control keeps an output of the light source at a first value. The second control makes the output of the light source change periodically between the first value and a second value lower than the first value.

Abstract translation: 根据一个实施例，提供一种包括光源，光照射元件和控制器的磁盘装置。 光照射元件被配置为从光源接收光以将光照射到磁盘上。 控制器被配置为根据要写入磁盘的数据的脉冲宽度在第一控制和第二控制之间切换。 第一控制将光源的输出保持在第一值。 第二控制使得光源的输出在第一值和低于第一值的第二值之间周期性地改变。

公开(公告)号：US09087527B1

公开(公告)日：2015-07-21

申请号：US14526335

申请日：2014-10-28

Applicant: Western Digital (Fremont), LLC

Inventor： Shaoping Li ,  Steven C. Rudy ,  Gerardo A. Bertero ,  Yunfei Ding ,  Christopher L. Beaudry

IPC: G11B5/187 ,  G11B5/33

CPC classification number: G11B5/02 ,  G11B5/11 ,  G11B5/3909 ,  G11B5/3912 ,  G11B5/3958 ,  G11B5/4886 ,  G11B2005/3996

Abstract: A read transducer having a first read sensor, a second read sensor, and a first middle shield is provided. The second read sensor is disposed in a down track direction from the first read sensor. The first middle shield is disposed between the first read sensor and the second read sensor. The first middle shield includes a first metallic middle shield layer disposed between the first read sensor and the second read sensor, a second metallic middle shield layer disposed between the first metallic middle shield layer and the second read sensor, and a first magnetic-spacer layer disposed between the first metallic middle shield layer and the second metallic middle shield layer. The first metallic middle shield layer and the second metallic middle shield layer have substantially the same polarity.

Abstract translation: 提供具有第一读取传感器，第二读取传感器和第一中间屏蔽的读取传感器。 第二读取传感器沿着第一读取传感器的向下的轨道方向设置。 第一中间屏蔽设置在第一读取传感器和第二读取传感器之间。 第一中间屏蔽包括设置在第一读取传感器和第二读取传感器之间的第一金属中间屏蔽层，设置在第一金属中间屏蔽层和第二读取传感器之间的第二金属中间屏蔽层，以及第一磁性间隔层 设置在第一金属中间屏蔽层和第二金属中间屏蔽层之间。 第一金属中间屏蔽层和第二金属中间屏蔽层具有大致相同的极性。

公开(公告)号：US09074941B1

公开(公告)日：2015-07-07

申请号：US13827089

申请日：2013-03-14

Applicant: Western Digital Technologies, Inc.

Inventor： Alexander Krichevsky ,  Robert J. Johnson

IPC: G07D5/00 ,  G01K7/00

CPC classification number: G01K7/00 ,  G01K7/01 ,  G01K2217/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/40 ,  G11B5/5534 ,  G11B2005/0021

Abstract: Systems and methods for measuring ambient and laser temperature in heat assisted magnetic recording (HAMR) systems are provided. One such system includes a slider having a write head, a laser diode coupled to the slider and configured to direct energy to a magnetic medium, and a preamplifier circuit including a voltage measurement circuit configured to measure a voltage drop across the laser diode, and a current measurement circuit configured to measure a current through the laser diode, where the preamplifier circuit is configured to store calibration information including a plurality of temperatures corresponding with measurements of the voltage drop across the laser diode and measurements of the current through the laser diode, and calculate a temperature based on the measured voltage drop across the laser diode, the measured current through the laser diode, and the calibration information.

Abstract translation: 提供了用于测量热辅助磁记录（HAMR）系统中的环境温度和激光温度的系统和方法。 一种这样的系统包括具有写入头，耦合到滑块并被配置为将能量引导到磁性介质的激光二极管的滑块和包括被配置成测量激光二极管两端的电压降的电压测量电路的前置放大器电路，以及 电流测量电路，被配置为测量通过激光二极管的电流，其中前置放大器电路被配置为存储校准信息，该校准信息包括对应于激光二极管上的电压降的测量值和通过激光二极管的电流的测量值的多个温度，以及 基于测量的激光二极管上的电压降，通过激光二极管的测量电流和校准信息来计算温度。

公开(公告)号：US09053716B1

公开(公告)日：2015-06-09

申请号：US14271743

申请日：2014-05-07

Applicant: HGST Netherlands B.V.

Inventor： Takuya Matsumoto ,  Shen Ren ,  Barry C. Stipe

IPC: G11B11/00 ,  G11B5/31 ,  G11B5/02

CPC classification number: G11B5/314 ,  G11B5/02 ,  G11B5/6088 ,  G11B2005/0021

Abstract: Embodiments disclosed herein generally relate to a magnetic write head including a media facing surface and a surface opposite the media facing surface. The magnetic write head also includes a SSC having a first end extending to the surface opposite the media facing surface. The first end of the SSC has at least two tips. The multiple-tipped first end of the SSC is configured to receive a laser beam and the laser beam coupling efficiency is improved by having the multiple-tipped first end.

Abstract translation: 本文公开的实施例通常涉及包括介质面向表面和与介质相对表面相对的表面的磁性写入头。 磁写头还包括SSC，其具有延伸到与介质相对表面相对的表面的第一端。 SSC的第一端至少有两个提示。 SSC的多头第一端被配置为接收激光束，并且通过具有多尖端的第一端来提高激光束耦合效率。

公开(公告)号：US09047917B1

公开(公告)日：2015-06-02

申请号：US14090873

申请日：2013-11-26

Applicant: Western Digital Technologies, Inc.

Inventor： Dennis W. Hogg

IPC: G11B5/09 ,  G11B20/10 ,  G11B5/012 ,  G11B5/02

CPC classification number: G11B5/455 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B5/4853 ,  G11B5/5526 ,  G11B5/58 ,  G11B20/10018 ,  G11B20/10027

Abstract: A disk drive slider is disclosed comprising a first read element for generating a first read signal, and a first sense amplifier comprising a first input terminal coupled to the first read element, a first output terminal coupled to a first output line, and a first supply terminal coupled to a supply line. The first sense amplifier is for amplifying the first read signal to generate a first amplified read signal, the first output line is for transmitting the first amplified read signal to a preamp, and the supply line is for coupling to the preamp in order to supply power to the first sense amplifier and supply a first bias to the first read element.

Abstract translation: 公开了一种磁盘驱动器滑块，其包括用于产生第一读取信号的第一读取元件，以及第一读出放大器，包括耦合到第一读取元件的第一输入端子，耦合到第一输出线路的第一输出端子和第一电源 端子耦合到电源线。 第一读出放大器用于放大第一读取信号以产生第一放大的读取信号，第一输出线用于将第一放大的读取信号传输到前置放大器，并且电源线用于耦合到前置放大器以便供电 到第一读出放大器，并向第一读取元件提供第一偏置。