公开(公告)号：US06538838B1

公开(公告)日：2003-03-25

申请号：US09425808

申请日：1999-10-25

申请人： Alexei H. Sacks ,  James H. McGlennen ,  Albert van der Schans

发明人： Alexei H. Sacks ,  James H. McGlennen ,  Albert van der Schans

IPC分类号： G11B558

CPC分类号： G11B5/5521 ,  G11B5/58

摘要： A method and apparatus are provided for testing a head to be used in a disc drive. The method is performed in a spin-stand and includes steps of positioning a head over a radial position on a disc, reading test data from a track at the radial position, reading servo data from the track, and using the servo data to position the head at a desired location within the track. The apparatus for practicing this method includes a disc capable of spinning, a positioning system capable of establishing a position for a head relative to the disc, a servo circuit capable of converting a servo signal into a position value, and a feedback circuit capable of controlling the positioning system based on the position value.

摘要翻译： 提供了一种用于测试在盘驱动器中使用的头的方法和装置。 该方法在旋转台中进行，并且包括将头部定位在盘上的径向位置上的步骤，从径向位置处的轨迹读取测试数据，从轨道读取伺服数据，以及使用伺服数据将位置 头部在轨道内的所需位置。 用于实施该方法的装置包括能够旋转的盘，能够建立头相对于盘的位置的定位系统，能够将伺服信号转换成位置值的伺服电路，以及能够控制的反馈电路 定位系统基于位置值。

公开(公告)号：US06490117B1

公开(公告)日：2002-12-03

申请号：US09425768

申请日：1999-10-22

申请人： Alexei H. Sacks ,  Li-Ping Wang ,  Donald E. Curtiss

发明人： Alexei H. Sacks ,  Li-Ping Wang ,  Donald E. Curtiss

IPC分类号： G11B2102

CPC分类号： G11B5/00 ,  G11B5/5534 ,  G11B5/59633

摘要： A method and apparatus for thermally writing a magnetic servo pattern on a magnetic disc medium prior to assembling the medium in a disc drive are provided in which the medium is first magnetized in a uniform magnetization direction. A plurality of magnetic domains are then thermally written on the medium, one magnetic domain at a time, by individually heating each magnetic domain with a light beam while exposing the magnetic domain to a magnetic field. The magnetic field has an orientation that is opposite to the uniform magnetization direction. The light beam forms an illumination pattern on the medium having a shape that at least partially defines a boundary of each magnetic domain.

摘要翻译： 提供了在将介质组装在盘驱动器中之前将磁性伺服图形热写入磁盘介质上的方法和装置，其中介质首先以均匀的磁化方向被磁化。 然后通过在将磁畴暴露于磁场的同时用光束单独加热每个磁畴，将多个磁畴一次热写入介质一个磁畴。 磁场具有与均匀磁化方向相反的取向。 光束在具有至少部分地限定每个磁畴的边界的形状的介质上形成照明图案。

公开(公告)号：US06181505B2

公开(公告)日：2001-01-30

申请号：US09268009

申请日：1999-03-15

申请人： Alexei H. Sacks ,  Timothy F. Ellis

发明人： Alexei H. Sacks ,  Timothy F. Ellis

IPC分类号： G11B5596

CPC分类号： G11B20/10009 ,  G11B5/59605 ,  G11B5/59688 ,  G11B21/083 ,  G11B21/10 ,  G11B2020/10888

摘要： A synchronous digital demodulator and method for demodulating a read signal including a user data waveform and a servo waveform which are generated by a read head as the read head passes over a user data area and a servo area, respectively, on a medium in a storage device. The user data waveform is converted to a series of digital user data values at a user data sample rate. The series of digital user data values are then applied to a user data detector circuit. The servo waveform is converted to a series of digital servo values at a servo sample rate, which is independent from the user data sample rate. The series of digital servo values are demodulated synchronously with the servo waveform to produce a position error value indicative of a position error of the read head relative to a location on the medium.

摘要翻译： 一种用于解调包括用户数据波形和伺服波形的读取信号的同步数字解调器和方法，读取头分别在存储器中的介质上经过用户数据区域和伺服区域，由读取头产生 设备。 以用户数据采样率将用户数据波形转换成一系列数字用户数据值。 然后将一系列数字用户数据值应用于用户数据检测器电路。 伺服波形以伺服采样率转换为一系列数字伺服值，与用户数据采样率无关。 一系列数字伺服值与伺服波形同步解调，产生一个位置误差值，该位置误差值表示读取头相对于介质上位置的位置误差。

公开(公告)号：US07154699B2

公开(公告)日：2006-12-26

申请号：US10039063

申请日：2001-12-31

申请人： Pradeep K. Subrahamanyan ,  Patrick J. Korkowski ,  Waleed A. Farahat ,  Steven C Ehret ,  Gregg J. Severson ,  Thomas S Rasmussen ,  Albert Van der Schans ,  Alexei H. Sacks ,  James H. McGlennen

发明人： Pradeep K. Subrahamanyan ,  Patrick J. Korkowski ,  Waleed A. Farahat ,  Steven C Ehret ,  Gregg J. Severson ,  Thomas S Rasmussen ,  Albert Van der Schans ,  Alexei H. Sacks ,  James H. McGlennen

IPC分类号： G11B5/596

CPC分类号： G11B5/5552 ,  G11B5/596

摘要： A high bandwidth, large stroke spin-stand for testing components of a disc drive includes a coarse positioning stage and a rotary micropositioning stage. The spin-stand is capable of positioning a transducer head relative to the data storage disc based on one or both of: (1) an angular position of a rotary actuator arm in the rotary micropositioning stage; and (2) servo data read from the data storage disc. The angular position of the rotary actuator arm is detected by an encoder. In one embodiment, position adjustments are based on the detected angular position. In another embodiment, position adjustments are based on servo data read from the data storage disc, but are also conditional on angular position being consistent with the servo data. In yet another embodiment, both angular position and servo data from a track are linearized to generate PES adjustment parameters that are recorded on the data storage disc to redefine the track as more circular or to linearize the PES.

摘要翻译： 用于测试磁盘驱动器组件的高带宽大冲程旋转架包括粗定位台和旋转微定位台。 旋转台能够基于以下中的一个或两个来相对于数据存储盘定位换能器头：（1）旋转致动器臂在旋转微定位台中的角位置; 和（2）从数据存储盘读取的伺服数据。 旋转执行器臂的角度位置由编码器检测。 在一个实施例中，位置调整基于检测到的角位置。 在另一个实施例中，位置调整基于从数据存储盘读取的伺服数据，但也取决于与伺服数据一致的角位置。 在另一个实施例中，来自轨道的角位置和伺服数据都被线性化以产生记录在数据存储盘上的PES调整参数，以将轨道重新定义为更圆形或者使线性化PES。

公开(公告)号：US06614608B1

公开(公告)日：2003-09-02

申请号：US09496621

申请日：2000-02-02

申请人： Karl A. Belser ,  Alexei H. Sacks

发明人： Karl A. Belser ,  Alexei H. Sacks

IPC分类号： G11B509

CPC分类号： G11B5/5965

摘要： A data storage system includes a data storage disc for storing magnetically encoded data and servo information. The data storage disc includes a data layer adapted to be magnetically encoded with data to be written to the data storage disc, and a servo information layer formed beneath the data layer and having magnetic servo pits formed therein to provide servo information. The magnetic servo pits are positioned in portions of the servo information layer which are at least partially directly beneath magnetically encoded data regions on the data layer such that a data head can read both magnetically stored data and servo information from the disc at substantially the same time. A method of fabricating a magnetic data disc is also disclosed.

摘要翻译： 数据存储系统包括用于存储磁编码数据和伺服信息的数据存储盘。 数据存储盘包括适于对要写入数据存储盘的数据进行磁编码的数据层，以及形成在数据层之下并具有形成在其中的磁性伺服凹坑以提供伺服信息的伺服信息层。 磁伺服凹坑定位在伺服信息层的至少部分直接位于数据层上的磁编码数据区之下的部分中，使得数据头可基本同时从盘读取磁存储的数据和伺服信息 。 还公开了一种制造磁数据盘的方法。

公开(公告)号：US06426845B1

公开(公告)日：2002-07-30

申请号：US09268012

申请日：1999-03-15

申请人： Alexei H. Sacks ,  Timothy F. Ellis

发明人： Alexei H. Sacks ,  Timothy F. Ellis

IPC分类号： G11B5596

CPC分类号： G11B21/081 ,  G11B5/5552 ,  G11B5/59655

摘要： An asynchronous demodulator and method is provided which determines a position error of a read head relative to a position on a medium in a storage device. The read head generates a-read signal as the read head passes over a servo area on the medium. The demodulator generates a normal demodulating signal that is asynchronous with the read signal and a quadrature demodulating signal that is ninety degrees out of phase with the normal demodulating signal. The read signal is multiplied by the normal demodulating signal and the quadrature demodulating signal to produce a normal position signal and a quadrature position signal. The demodulator produces a position error magnitude and a position error direction based on the normal position signal and the quadrature position signal.

摘要翻译： 提供一种异步解调器和方法，其确定读取头相对于存储设备中介质上的位置的位置误差。 读头在读取头通过介质上的伺服区域时产生读取信号。 解调器产生与读取信号异步的正常解调信号和与正常解调信号相差90度的正交解调信号。 读取信号乘以正常解调信号和正交解调信号，以产生正常位置信号和正交位置信号。 解调器基于正常位置信号和正交位置信号产生位置误差幅度和位置误差方向。

公开(公告)号：US5459624A

公开(公告)日：1995-10-17

申请号：US143561

申请日：1993-10-26

申请人： Kevin J. Erickson ,  Alexei H. Sacks

发明人： Kevin J. Erickson ,  Alexei H. Sacks

IPC分类号： G11B21/10 ,  G11B5/596

CPC分类号： G11B21/10

摘要： A phase plane trajectory trough method and apparatus for fast settling of a data transducer for positioning a transducer head over a selected track on a disk surface are provided for use in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk surface including a plurality of data tracks for storing data. An actuator moves the transducer head from one track location to another track location. A controller is coupled to the actuator for applying a gain control signal to control movement of the actuator. A phase plane trajectory trough function is defined for the disk file. Velocity and position states of the actuator are estimated and compared with the phase plane trajectory trough function for generating a base correction factor. The controller is responsive to both the estimated velocity and position states and the phase plane trajectory trough (PPTT) function for modifying the gain control signal.

摘要翻译： 提供用于快速建立数据传感器的相平面轨迹槽方法和装置，用于将传感器头定位在磁盘表面上的选定轨道上，用于磁盘文件。 磁盘文件包括至少一个安装用于绕轴旋转的盘，并且盘具有至少一个盘表面，其包括用于存储数据的多个数据轨道。 致动器将换能器头从一个轨道位置移动到另一轨道位置。 控制器耦合到致动器，用于施加增益控制信号以控制致动器的运动。 为磁盘文件定义了相平面轨迹槽功能。 估计执行器的速度和位置状态，并将其与用于产生基准校正因子的相平面轨迹槽功能进行比较。 控制器响应于估计的速度和位置状态以及用于修改增益控制信号的相平面轨迹槽（PPTT）功能。

公开(公告)号：US06952320B1

公开(公告)日：2005-10-04

申请号：US09733405

申请日：2000-12-08

申请人： Brian Pollock ,  Alexei H. Sacks ,  Brian Sudman ,  James H. McGlennen ,  Reed D. Hanson

发明人： Brian Pollock ,  Alexei H. Sacks ,  Brian Sudman ,  James H. McGlennen ,  Reed D. Hanson

IPC分类号： G11B5/596 ,  G11B15/12

CPC分类号： G11B5/59627

摘要： The present invention relates to repeatable runout (RRO) compensation of servo control systems that can be used in disc drives or spin-stands. The RRO relates to eccentricity between servo tracks, which were written onto a disc prior to the installation of the disc into the disc drive or spin-stand, and an axis of rotation of the disc. The present invention compensates the servo control loop by canceling the RRO and controlling a head to follow virtual tracks which are eccentric to the data tracks defined by the servo tracks and concentric with the axis of rotation of the disc.

摘要翻译： 本发明涉及可用于盘式驱动器或旋转架的伺服控制系统的可重复跳动（RRO）补偿。 RRO涉及在将盘安装到盘驱动器或旋转架之前写在盘上的伺服轨道之间的偏心度以及盘的旋转轴。 本发明通过取消RRO来补偿伺服控制回路，并且控制磁头跟随偏心于由伺服磁道限定的数据磁道并与磁盘的旋转轴线同心的虚拟磁道。

公开(公告)号：US06510015B2

公开(公告)日：2003-01-21

申请号：US09726786

申请日：2000-11-30

申请人： Alexei H. Sacks ,  Timothy F. Ellis ,  Patrick J. Korkowski ,  Karl A. Belser

发明人： Alexei H. Sacks ,  Timothy F. Ellis ,  Patrick J. Korkowski ,  Karl A. Belser

IPC分类号： G11B2102

CPC分类号： B82Y10/00 ,  G11B5/59633 ,  G11B5/59655 ,  G11B5/74 ,  G11B5/743 ,  G11B5/82 ,  G11B21/025

摘要： A magnetic medium comprises a magnetic disc having a read surface that has a plurality of tracks, at least some having servo sectors. The servo sectors comprise a plurality of magnetic irregularities, such as pits or regions of reduced magnetic coercivity, arranged in a servo pattern along the servo sector at a servo frequency. A magnetic pattern is recorded in the disc along the servo sector at a high carrier frequency. A process for manufacturing the servo pattern and for recovering servo data from the servo pattern are also described.

摘要翻译： 磁介质包括具有读表面的磁盘，该磁盘具有多个轨道，至少一些具有伺服扇区。 伺服扇区包括以伺服频率沿着伺服扇区布置在伺服模式中的多个磁性不规则性，例如凹陷或减小的磁矫顽力的区域。 沿着伺服扇区以高载波频率在磁盘中记录磁图案。 还描述了用于制造伺服模式并用于从伺服模式恢复伺服数据的处理。

公开(公告)号：US06469849B1

公开(公告)日：2002-10-22

申请号：US09655479

申请日：2000-09-05

申请人： Timothy F. Ellis ,  Alexei H. Sacks

发明人： Timothy F. Ellis ,  Alexei H. Sacks

IPC分类号： G11B502

CPC分类号： G11B21/081 ,  G11B5/5552 ,  G11B5/59655

摘要： A method of generating a position error estimate generates a phase field signal and a position error field signal. A set of operations is performed on the phase field signal and the same set of operations is performed on the position error field signal. The result obtained by performing the set of operations on the position error field signal is divided by the results obtained by performing the set of operations on the phase field signal. The result of the division is the position error estimate. In addition, a demodulation circuit is provided that utilizes field ratioing.

摘要翻译： 产生位置误差估计的方法产生相位场信号和位置误差场信号。 对相位场信号执行一组操作，并对位置误差场信号执行相同的一组操作。 通过对位置误差场信号执行一组操作而获得的结果除以通过对相位场信号执行一组操作获得的结果。 除法的结果是位置误差估计。 此外，提供利用场比的解调电路。