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公开(公告)号：US08947823B1
公开(公告)日：2015-02-03
申请号：US14199269
申请日：2014-03-06
CPC分类号： G11B5/6076 , G11B5/6029
摘要： A method of detecting head touchdown in a storage device includes monitoring storage device head contact sensor signals, and processing the monitored storage device head contact sensor signals in a digital domain. The processing may occur in a data path of the storage device, such as the read channel of the storage device. The processing may monitor for head touchdown only during other than read operations. Further, during servo read operation, the storage device head contact sensor may continue to generate signals, and the storage device head contact sensor signals may be squelched. Storage device head contact sensor signals also may be squelched during intervals before and after the servo read operation. The processing may includes accumulating a moving sum of squares of the storage device head contact sensor signals, and comparing the moving sum of squares of the storage device head contact sensor signals to a threshold.
摘要翻译： 一种在存储装置中检测磁头触地的方法包括监视存储装置磁头接触传感器信号，以及在数字域中处理所监视的存储装置磁头接触传感器信号。 处理可以在存储设备的数据路径中发生，诸如存储设备的读取通道。 处理可以仅在读取操作期间监视头部触地。 此外，在伺服读取操作期间，存储装置头接触传感器可以继续产生信号，并且存储装置头接触传感器信号可能被压扁。 存储设备头接触传感器信号也可以在伺服读取操作之前和之后的间隔期间被压扁。 处理可以包括累积存储装置头接触传感器信号的移动移动的平方和，并将存储装置头部接触传感器信号的移动移动和的平方值与阈值进行比较。
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公开(公告)号：US08922924B1
公开(公告)日：2014-12-30
申请号：US14097960
申请日：2013-12-05
发明人： Hongxin Song , Michael Madden
IPC分类号： G11B20/10
CPC分类号： G11B20/10203
摘要： Systems and methods for the correction of DC noise in signals read by a head of a disk drive are presented. Circuitry on a first data path may be configured to filter an input signal to remove a DC component. Acquisition parameters on the first data path may be configured based on the filtered signal. Circuitry on a second data path may be configured to adjust the input signal based on the configured acquisition parameters. A mean of a window of data samples of the adjusted input signal may be computed. Based on the computed mean, a correction may be applied to the adjusted input signal until a stopping rule is satisfied.
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3.发明授权Systems and methods for inter-track interference cancellation in magnetic recording channels 有权磁记录通道中轨道间干扰消除的系统和方法公开(公告)号：US08773792B1
公开(公告)日：2014-07-08
申请号：US14028805
申请日：2013-09-17
发明人： Hongxin Song , Nitin Nangare , Michael Madden , Gregory Burd
CPC分类号： G11B5/09 , G11B5/012 , G11B20/10009 , G11B20/10222
摘要： A system including an analog front end module to receive a first signal generated by reading data from a storage medium storing the data in concentric tracks, sample the first signal, and output a second signal based on the sampling of the first signal. An equalizer module generates a first vector based on the second signal. The first vector represents the data in the first signal. A detector module generates a second vector based on the first vector. The second vector represents a noise-free vector corresponding to the first vector. A re-timing module re-samples a plurality of samples in the first vector based on the second vector and generates a third vector based on the re-sampling of the plurality of samples in the first vector. An inter-track interference cancellation module removes inter-track interference from the third vector.
摘要翻译： 一种包括模拟前端模块的系统，用于接收通过从存储在同心轨道中的数据的存储介质读取数据而产生的第一信号，对第一信号进行采样，并且基于第一信号的采样来输出第二信号。 均衡器模块基于第二信号产生第一矢量。 第一个向量表示第一个信号中的数据。 检测器模块基于第一矢量生成第二矢量。 第二矢量代表对应于第一矢量的无噪声矢量。 重新定时模块基于第二向量对第一向量中的多个样本重新采样，并且基于第一向量中的多个样本的重新采样生成第三矢量。 轨道间干扰消除模块消除来自第三矢量的轨道间干扰。
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公开(公告)号：US08625218B1
公开(公告)日：2014-01-07
申请号：US13718404
申请日：2012-12-18
发明人： Hongxin Song , Michael Madden
IPC分类号： G11B20/10
CPC分类号： G11B20/10203
摘要： Systems and methods for the correction of DC noise in signals read by a head of a disk drive are presented. Circuitry on a first data path may be configured to filter an input signal to remove a DC component. Acquisition parameters on the first data path may be configured based on the filtered signal. Circuitry on a second data path may be configured to adjust the input signal based on the configured acquisition parameters. A mean of a window of data samples of the adjusted input signal may be computed. Based on the computed mean, a correction may be applied to the adjusted input signal until a stopping rule is satisfied.
摘要翻译： 提出了用于校正由磁盘驱动器的磁头读取的信号中的DC噪声的系统和方法。 可以将第一数据路径上的电路配置为对输入信号进行滤波以去除DC分量。 可以基于滤波信号来配置第一数据路径上的采集参数。 第二数据路径上的电路可以被配置为基于配置的采集参数调整输入信号。 可以计算经调整的输入信号的数据样本窗口的平均值。 基于计算的平均值，可以对调整的输入信号进行校正，直到满足停止规则。
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5.发明授权Method and apparatus for adjusting a sampling frequency of a data signal read from a storage medium 有权用于调节从存储介质读取的数据信号的采样频率的方法和装置公开(公告)号：US08537483B1
公开(公告)日：2013-09-17
申请号：US13625427
申请日：2012-09-24
发明人： Michael Madden
IPC分类号： G11B5/09
CPC分类号： G11B20/10222 , G11B5/59627
摘要： A system including a mark module, an estimation module and an adjustment module. The mark module is configured to generate a first indicator for a first mark on a storage medium detected when first servo data is read from the storage medium, and a second indicator for a second mark on the storage medium detected when second servo data is read from the storage medium. The estimation module is configured to, based on i) a first location of a center of the storage medium about which the storage medium is rotated, and ii) a period between times when the first indicator and the second indicator are generated, estimate a first distance or an offset angle relative to the first location. The adjustment module is configured to, based on the first distance or the offset angle, adjust a sampling frequency at which user data is read from the storage medium.
摘要翻译： 一种包括标记模块，估计模块和调整模块的系统。 标记模块被配置为在从存储介质读取第一伺服数据时检测到的存储介质上的第一标记的第一指示符，以及当从第二伺服数据读取时检测到的存储介质上的第二标记的第二指示符 存储介质。 估计模块被配置为基于i）存储介质围绕其旋转的存储介质的中心的第一位置，以及ii）产生第一指示符和第二指示符的时间之间的周期，估计第一 距离或相对于第一位置的偏移角度。 调整模块被配置为基于第一距离或偏移角来调整从存储介质读取用户数据的采样频率。
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6.发明授权公开(公告)号：US09583137B1
公开(公告)日：2017-02-28
申请号：US13715980
申请日：2012-12-14
发明人： Zining Wu , Michael Madden
IPC分类号： G11B21/02
CPC分类号： G11B21/02 , G11B5/59655 , G11B5/59688 , G11B5/746
摘要： A system includes, in at least one aspect, a storage device including patterned media and a head; and a read channel configured to: receive a DC readback signal from the head, the DC readback signal including position error signal (PES) information associated with a position of the head with respect to the patterned media, and determine the position of the head with respect to the patterned media based on a result of summing the DC components of the PES information.
摘要翻译： 在至少一个方面，系统包括包括图案化介质和头部的存储设备; 以及读通道，其被配置为：从头部接收DC回读信号，所述DC回读信号包括与头部相对于图案化介质的位置相关联的位置误差信号（PES）信息，并且确定头部的位置 基于对PES信息的DC分量求和的结果，相对于图案化媒体。
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公开(公告)号：US08947810B1
公开(公告)日：2015-02-03
申请号：US14202739
申请日：2014-03-10
发明人： Gregory Burd , Qiyue Zou , Michael Madden , Kar Shing Chiu , Vincent Wong
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。
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公开(公告)号：US08824074B1
公开(公告)日：2014-09-02
申请号：US14067381
申请日：2013-10-30
发明人： Xueshi Yang , Yu-Yao Chang , Michael Madden , Zining Wu
CPC分类号： G11B20/1816 , G11B2220/2516
摘要： Methods, systems and computer program products for performing hybrid defect detection are disclosed. In some implementations, an apparatus includes a signal module to process data signals corresponding to data on a storage medium to generate signal samples. The apparatus includes a first defect detector to identify a first portion of the signal samples, determine a number of the signal samples in the first portion that are associated with abnormal signal characteristics, and generate a first output based on the number of the signal samples in the first portion that are associated with abnormal signal characteristics. The apparatus includes a second defect detector to identify a second portion of the signal samples different from the first portion, and generate a second output based on a correlation between data bits and signal samples in the second portion.
摘要翻译： 公开了用于执行混合缺陷检测的方法，系统和计算机程序产品。 在一些实施方式中，一种装置包括信号模块，用于处理对应于存储介质上的数据的数据信号以产生信号采样。 该装置包括：第一缺陷检测器，用于识别信号样本的第一部分，确定第一部分中与异常信号特征相关联的信号样本的数量，并且基于信号样本的数量生成第一输出 与异常信号特征相关的第一部分。 该装置包括第二缺陷检测器，用于识别不同于第一部分的信号样本的第二部分，并且基于第二部分中的数据位和信号样本之间的相关性产生第二输出。
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公开(公告)号：US09418690B1
公开(公告)日：2016-08-16
申请号：US14720469
申请日：2015-05-22
发明人： Hongxin Song , Michael Madden , Gregory Burd
CPC分类号： G11B5/59627 , G06F17/18 , G11B20/10037 , G11B20/10222
摘要： Systems, methods, apparatus, and techniques are provided for producing an estimate of a digital sequence. A continuous-time signal is obtained. The continuous-time signal is sampled with an oversampling factor to produce a discrete-time signal corresponding to the continuous-time signal. A phase offset estimate of the continuous-time signal is produced based on the discrete-time signal. The discrete-time signal is interpolated based on the phase offset estimate to produce an interpolated discrete-time signal. The interpolated discrete-time signal is processed to produce an estimate of a digital sequence.
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10.发明授权Apparatus and method for adjusting a phase of a data clock signal using a predetermined bit pattern 有权用于使用预定位模式调整数据时钟信号的相位的装置和方法公开(公告)号：US09202515B1
公开(公告)日：2015-12-01
申请号：US14280934
申请日：2014-05-19
发明人： Michael Madden , Gregory Burd , Qiyue Zou
IPC分类号： G11B20/10
CPC分类号： G11B20/10222 , G11B5/59616 , G11B5/59644 , G11B5/746
摘要： A read/write channel module for writing data to and reading data from a storage medium. A servo channel module is configured to recover a servo field from the storage medium in accordance with a read signal read from the storage medium and a first clock signal. A locator module is configured to determine, based on a location of the servo field recovered from the storage medium, a location of a predetermined bit pattern that is located subsequent to the servo field on the storage medium. A phase error calculator module is configured to estimate a phase error of a second clock signal based on the location of the predetermined bit pattern, wherein a phase and a frequency of the second clock signal are different than a phase and a frequency of the first clock signal, and adjust the phase of the second clock signal based on the estimated phase error.
摘要翻译： 读/写通道模块，用于向存储介质写入数据和从存储介质读取数据。 伺服通道模块被配置为根据从存储介质读取的读取信号和第一时钟信号从存储介质恢复伺服字段。 定位器模块被配置为基于从存储介质恢复的伺服字段的位置来确定位于存储介质上的伺服字段之后的预定位模式的位置。 相位误差计算器模块被配置为基于预定位模式的位置来估计第二时钟信号的相位误差，其中第二时钟信号的相位和频率不同于第一时钟的相位和频率 信号，并且基于估计的相位误差来调整第二时钟信号的相位。
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