公开(公告)号：US08531792B1

公开(公告)日：2013-09-10

申请号：US12951923

申请日：2010-11-22

申请人： Gregory Burd ,  Qiyue Zou ,  Xueshi Yang

发明人： Gregory Burd ,  Qiyue Zou ,  Xueshi Yang

IPC分类号： G11B5/09 ,  G11B21/02

CPC分类号： G11B5/59666 ,  G11B5/59661 ,  G11B5/743

摘要： The present disclosure includes systems and techniques relating to control of magnetic recording devices, such as disk drives. A recording device can contain a medium that includes data tracks disposed on discrete strips of magnetic material that are arranged based on circumferences of the medium. The medium can include servo regions disposed on discrete strips of magnetic material that are arranged based on radii of the medium and extend from an inner diameter of the medium to an outer diameter of the medium. A described technique includes receiving data indicative of a waveform produced by a head operated with respect to a recording medium, detecting, when the medium is in a state of uniform magnetic polarity, a beginning of a servo region of the servo regions based on the waveform changing from a non-alternating signal to an alternating signal, the non-alternating signal being indicative of the head's path over a data track of the data tracks, and the alternating signal being indicative of the head's path over discrete magnetic strips in the servo region, performing a synchronization of one or more clocks based on the detected beginning of the servo region, and writing, based on the synchronization, data to the servo region for servo control of the medium.

摘要翻译： 本公开包括与磁记录装置（例如磁盘驱动器）的控制有关的系统和技术。 记录装置可以包含介质，该介质包括设置在基于介质的周长排列的离散的磁性材料条上的数据轨道。 介质可以包括设置在基于介质的半径并且从介质的内径延伸到介质的外径的离散的磁性材料条带上的伺服区域。 所描述的技术包括接收指示由相对于​​记录介质操作的磁头产生的波形的数据，当介质处于均匀磁极性的状态时，基于波形检测伺服区域的伺服区域的开始 从非交替信号切换到交替信号，所述非交变信号指示所述数据磁道的数据磁道上的磁头路径，并且所述交替信号表示所述磁头在所述伺服区域中的离散磁条上的路径 基于检测到的伺服区域的开始执行一个或多个时钟的同步，并且基于该同步将数据写入到用于伺服控制介质的伺服区域。

公开(公告)号：US08477444B1

公开(公告)日：2013-07-02

申请号：US12786242

申请日：2010-05-24

申请人： Qiyue Zou ,  Xueshi Yang ,  Gregory Burd

发明人： Qiyue Zou ,  Xueshi Yang ,  Gregory Burd

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59627 ,  G11B5/59616 ,  G11B5/746

摘要： The present disclosure includes systems and techniques relating to control of magnetic recording devices, such as disk drives. Systems and techniques include generating timing data based on a clock signal and a waveform produced by a head operated with respect to a rotating recording medium and the clock signal, determining model parameters based on the timing data to model deterministic disturbances associated with the rotating recording medium, predicting a frequency offset by a model-based technique for the compensation of the deterministic disturbances between two servo wedges, predicting a frequency offset associated with one or more nondeterministic disturbances by a loop filter, determining a clock adjustment based on the predicted deterministic and nondeterministic frequency offsets, and adjusting a clock frequency to read or write data within the area.

摘要翻译： 本公开包括与磁记录装置（例如磁盘驱动器）的控制有关的系统和技术。 系统和技术包括基于时钟信号和由相对于旋转记录介质操作的磁头产生的波形产生定时数据和时钟信号，基于定时数据确定模型参数以建模与旋转记录介质相关联的确定性干扰 通过基于模型的技术预测用于补偿两个伺服楔之间的确定性干扰的频率偏移，通过环路滤波器预测与一个或多个非确定性干扰相关联的频率偏移，基于预测的确定性和非确定性确定时钟调整 频率偏移，以及调整时钟频率以读取或写入该区域内的数据。

公开(公告)号：US08879185B1

公开(公告)日：2014-11-04

申请号：US13288276

申请日：2011-11-03

申请人： Qiyue Zou ,  Gregory Burd ,  Michael Madden

发明人： Qiyue Zou ,  Gregory Burd ,  Michael Madden

IPC分类号： G11B5/09

CPC分类号： G11B5/746 ,  G11B5/59616

摘要： Systems, methods, apparatus, and techniques are provided for controlling synchronization of a write clock. A frequency offset is estimated based, at least partially, on a location of the servo synchronization marker to produce the frequency offset estimate. A phase correction value and a frequency correction value associated with the write clock are obtained, and a data clock timing control signal is produced based on the frequency offset estimate, the phase correction value, and the frequency correction value. The data clock timing control signal is applied to a phase interpolator to modify a phase of the write clock.

摘要翻译： 提供了用于控制写时钟的同步的系统，方法，装置和技术。 至少部分地基于伺服同步标记的位置来估计频率偏移，以产生频率偏移估计。 获得与写时钟相关联的相位校正值和频率校正值，并且基于频率偏移估计，相位校正值和频率校正值产生数据时钟定时控制信号。 数据时钟定时控制信号被施加到相位插值器以修改写入时钟的相位。

公开(公告)号：US08331050B1

公开(公告)日：2012-12-11

申请号：US12888744

申请日：2010-09-23

申请人： Qiyue Zou ,  Xueshi Yang ,  Gregory Burd

发明人： Qiyue Zou ,  Xueshi Yang ,  Gregory Burd

IPC分类号： G11B5/09

CPC分类号： G11B5/746 ,  G11B5/59616

摘要： A write clock synchronization system includes a channel module that reads a servo section of a bit-patterned magnetic medium to determine a preamble signal based on the servo section. An initial phase estimating system estimates an initial phase of the preamble signal based on servo clock samples of the preamble signal and estimates an initial phase of the preamble signal based on write clock samples of the preamble signal. A phase determination module estimates a phase of the write clock signal based on the initial phase of the preamble signal estimated using the servo clock samples and the initial phase of the preamble signal estimated using the write clock samples. A phase error module estimates a phase error based on the phase of the write clock signal. The channel module writes data to discontinuous bit islands of the bit-patterned magnetic medium based on the phase error.

摘要翻译： 写时钟同步系统包括通道模块，其读取位图形磁介质的伺服部分，以基于伺服部分确定前导信号。 初始相位估计系统基于前导信号的伺服时钟采样来估计前置信号的初始相位，并且基于前导码信号的写入时钟采样来估计前导码信号的初始相位。 相位确定模块基于使用伺服时钟采样估计的前导信号的初始相位和使用写入时钟采样估计的前导信号的初始相位来估计写入时钟信号的相位。 相位误差模块基于写时钟信号的相位来估计相位误差。 通道模块基于相位误差将数据写入位图形磁介质的不连续位岛。

公开(公告)号：US08730605B1

公开(公告)日：2014-05-20

申请号：US13346941

申请日：2012-01-10

申请人： Michael Madden ,  Gregory Burd ,  Qiyue Zou

发明人： Michael Madden ,  Gregory Burd ,  Qiyue Zou

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B20/10222 ,  G11B5/59616 ,  G11B5/59644 ,  G11B5/746

摘要： A bit patterned recording system includes a servo channel module configured to recover servo fields written with servo information. A field locator module is configured to locate a field printed to data islands of a medium based on a location of one of the servo fields. The servo islands and the data islands have different spacing. A servo clock has a different phase and frequency than a data clock. A phase error calculator module is configured to estimate a phase error of the data clock based on the field and the data clock. The phase error is used to adjust a phase of the data clock.

摘要翻译： 有位图案记录系统包括：伺服信道模块，被配置为恢复用伺服信息写入的伺服字段。 场定位器模块被配置为基于伺服字段之一的位置来定位打印到介质的数据岛的字段。 伺服岛和数据岛具有不同的间距。 伺服时钟的相位和频率与数据时钟不同。 相位误差计算器模块被配置为基于场和数据时钟来估计数据时钟的相位误差。 相位误差用于调整数据时钟的相位。

公开(公告)号：US08693124B1

公开(公告)日：2014-04-08

申请号：US13172268

申请日：2011-06-29

申请人： Gregory Burd ,  Qiyue Zou ,  Michael Madden ,  Kar Shing Chiu ,  Vincent Wong

发明人： Gregory Burd ,  Qiyue Zou ,  Michael Madden ,  Kar Shing Chiu ,  Vincent Wong

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59616 ,  G11B5/09

摘要： Techniques are provided for performing bit-locked operations on media. A first control signal is received from a first source, and a second control signal is generated at a second source in response to receiving the first control signal. The media is accessed according to the second control signal. One or more synchronization markers are located during the accessing of the media, and bit-level synchronization between the second source and the media is achieved based, at least partially, on the one or more synchronization markers. A control operation is performed on the media with bit-level synchrony between the second source and the media.

摘要翻译： 提供了技术来执行媒体上的锁定操作。 响应于接收到第一控制信号，从第一源接收第一控制信号，并且在第二源产生第二控制信号。 根据第二控制信号来访问介质。 在媒体访问期间定位一个或多个同步标记，并且至少部分地基于一个或多个同步标记来实现第二源和介质之间的位级同步。 在第二个源和媒体之间的位级同步的介质上执行控制操作。

公开(公告)号：US08687304B1

公开(公告)日：2014-04-01

申请号：US13007787

申请日：2011-01-17

申请人： Qiyue Zou ,  Xueshi Yang ,  Gregory Burd

发明人： Qiyue Zou ,  Xueshi Yang ,  Gregory Burd

IPC分类号： G11B5/09

CPC分类号： G11B20/14 ,  G11B5/012 ,  G11B5/09 ,  G11B5/59616 ,  G11B5/746

摘要： A write clock synchronization system includes a first module configured to generate a write clock signal. A second module is configured to, based on a sensor signal received, detect a pattern of bit islands on bit-patterned media. The second module is configured to determine a phase error of the write clock signal based on the pattern of the bit islands. A third module is configured to at least one of adjust or select a phase of the write clock signal based on the phase error.

摘要翻译： 写时钟同步系统包括被配置为产生写时钟信号的第一模块。 第二模块被配置为基于所接收的传感器信号来检测位图案介质上的位岛的图案。 第二模块被配置为基于位岛的图案来确定写入时钟信号的相位误差。 第三模块被配置为基于相位误差调整或选择写入时钟信号的相位中的至少一个。

公开(公告)号：US08508879B1

公开(公告)日：2013-08-13

申请号：US12949693

申请日：2010-11-18

申请人： Qiyue Zou ,  Supaket Katchmart ,  Gregory Burd

发明人： Qiyue Zou ,  Supaket Katchmart ,  Gregory Burd

IPC分类号： G11B5/09

CPC分类号： G11B20/1024 ,  G11B5/59616 ,  G11B5/746 ,  G11B20/10435 ,  G11B2220/252

摘要： The present disclosure includes systems and techniques relating to control of magnetic recording devices, such as disk drives. A described technique includes producing signals that include a write clock signal and a servo clock signal, processing a waveform produced by a read head operated with respect to a recording medium, which includes magnetic bit cells arranged on tracks, and the servo clock signal. The technique includes producing, based on the waveform, a servo detect pulse that indicates a detection of servo data, measuring a timing difference that is based on the servo detect pulse and a write pulse of the write clock signal, and controlling an adjustment of a phase of the write clock signal based on the timing difference to align the write clock signal with at least a portion of the bit cells.

摘要翻译： 本公开包括与磁记录装置（例如磁盘驱动器）的控制有关的系统和技术。 所描述的技术包括产生包括写时钟信号和伺服时钟信号的信号，处理由相对于记录介质操作的读取头产生的波形，其包括布置在轨道上的磁位单元和伺服时钟信号。 该技术包括基于波形产生指示伺服数据的检测的伺服检测脉冲，测量基于伺服检测脉冲的定时差和写入时钟信号的写入脉冲，以及控制对 基于定时差来写入时钟信号的相位，以将写入时钟信号与位单元的至少一部分对准。

公开(公告)号：US08508878B1

公开(公告)日：2013-08-13

申请号：US12949681

申请日：2010-11-18

申请人： Qiyue Zou ,  Supaket Katchmart ,  Gregory Burd

发明人： Qiyue Zou ,  Supaket Katchmart ,  Gregory Burd

IPC分类号： G11B5/09

CPC分类号： G11B20/10222 ,  G11B5/09 ,  G11B5/59616 ,  G11B5/746 ,  G11B2005/0026

摘要： The present disclosure includes systems and techniques relating to control of magnetic recording devices, such as disk drives. A described technique includes receiving a waveform produced by a read head operated with respect to a recording medium and a servo clock signal. A medium can include magnetic data bit cells, a first servo wedge, a second servo wedge, and phase tracking fields, where at least a portion of the phase tracking fields are arranged between the first servo wedge and the second servo wedge. The servo wedges can include respective servo sync marks. The technique includes producing, based on the waveform, a servo detect pulse that indicates a detection of a servo sync mark. The technique includes controlling a first adjustment of a phase of a write clock signal, the first adjustment being responsive to the servo detect pulse. The technique includes producing, based on the write clock signal, samples of the waveform that correspond to phase tracking fields. The technique includes controlling second adjustments of the phase based on the samples to align the write clock signal with at least a portion of the bit cells, the second adjustments being responsive to the phase tracking fields, respectively.

摘要翻译： 本公开包括与磁记录装置（例如磁盘驱动器）的控制有关的系统和技术。 所描述的技术包括接收由相对于记录介质操作的读取头和伺服时钟信号产生的波形。 介质可以包括磁数据位单元，第一伺服楔，第二伺服楔和相位跟踪场，其中相位跟踪场的至少一部分布置在第一伺服楔和第二伺服楔之间。 伺服楔可以包括相应的伺服同步标记。 该技术包括基于波形产生指示伺服同步标记的检测的伺服检测脉冲。 该技术包括控制写时钟信号的相位的第一调整，第一调整响应伺服检测脉冲。 该技术包括基于写时钟信号产生对应于相位跟踪场的波形样本。 该技术包括基于采样来控制相位的第二调整以将写时钟信号与位单元的至少一部分对准，第二调整分别响应于相位跟踪场。