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公开(公告)号：US07075748B2
公开(公告)日：2006-07-11
申请号：US10997153
申请日：2004-11-24
申请人： Matthew T. White , Satoshi Yamamoto
发明人： Matthew T. White , Satoshi Yamamoto
IPC分类号： G11B5/596
CPC分类号： G11B5/5552 , G11B5/5534
摘要： A dual-stage actuator disk drive has calibration tracks located in a nondata band, and uses a secondary-actuator failure detection and calibration test run by the servo control processor. The calibration tracks contain a pattern of pre-written magnetized test blocks. The test is run with the primary actuator biased against a crash stop, which enables the read head to access the calibration tracks. The servo control processor generates a test signal to the secondary actuator and receives a calibration signal from the read head as the read head detects the test blocks in the calibration tracks. The test comprises two measurements: a measurement of the secondary actuator static characteristics, and a measurement of the secondary actuator dynamic characteristics.
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2.发明授权Disk drive with support structure for air dams and disk-vibration capacitive sensors 失效磁盘驱动器，具有气坝和磁盘振动电容传感器的支撑结构公开(公告)号：US07499243B2
公开(公告)日：2009-03-03
申请号：US11835309
申请日：2007-08-07
申请人： Toshiki Hirano , Tetsuo Semba , Matthew T. White
发明人： Toshiki Hirano , Tetsuo Semba , Matthew T. White
IPC分类号： G11B33/14
CPC分类号： G11B5/58 , G11B5/5582 , G11B5/596 , G11B33/08
摘要： A data recording disk drive has one or more capacitive sensors for sensing out-of-plane vibration of the disk or disks. The sensors are attached to a support structure that is attached to the disk drive housing. Each sensor is associated with a disk and faces a surface of the disk near the outer perimeter of the disk and close to the recording head. The support structure can be made of a metal or a high-strength plastic and can be a separate structure mounted to the housing, or integrated as part of the single-piece housing casting. If it is metallic, as would be the case if it were integrated with the housing, then layers of insulating material separate the sensors from the support structure. A support structure that serves other functions in the disk drive, such as a support for air dams that extend between the disks, can also function as the support structure for the capacitive sensors.
摘要翻译： 数据记录磁盘驱动器具有用于感测盘或盘的平面外振动的一个或多个电容传感器。 传感器连接到附接到磁盘驱动器外壳的支撑结构。 每个传感器与磁盘相关联并且面对靠近盘的外周边的盘的表面并且靠近记录头。 支撑结构可以由金属或高强度塑料制成，并且可以是安装到壳体的单独结构，或者作为单件式外壳铸件的一部分集成。 如果是金属的，如果将其与外壳结合在一起，则绝缘材料层将传感器与支撑结构分开。 用于磁盘驱动器中的其他功能的支撑结构（例如在盘之间延伸的气坝的支撑）也可以用作电容式传感器的支撑结构。
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3.发明授权Magnetic recording disk drive with multiple feedforward controllers for rotational vibration cancellation 失效具有多个前馈控制器的磁记录磁盘驱动器用于旋转振动消除公开(公告)号：US07375916B2
公开(公告)日：2008-05-20
申请号：US11378459
申请日：2006-03-17
申请人： Tetsuo Semba , Matthew T. White , Kevin I. Tzou
发明人： Tetsuo Semba , Matthew T. White , Kevin I. Tzou
IPC分类号： G11B5/596
CPC分类号： G11B19/04
摘要： A disk drive has multiple feedforward controllers for handling external disturbances, such as rotational vibration (RV), that have different external disturbance frequency spectra. Each feedforward controller is designed to be optimal for a canceling a specific associated RV spectrum. The actual RV spectrum acting on the disk drive is determined and the proper feedforward controller is then selected and used to generate a compensation signal for canceling the RV. Each feedforward controller may be tested when the disk drive is experiencing the RV, and the resulting compensation signal and PES measured. The feedforward controller that produces the best external disturbance cancellation is then selected as the feedforward controller. A signal from a RV sensor may be used to detect the peak frequency of the actual RV spectrum. This detected peak frequency is then matched to a peak frequency in a plurality of peak frequencies in a lookup table, and the feedforward controller associated with the matching peak frequency is selected as the feedforward controller.
摘要翻译： 磁盘驱动器具有多个前馈控制器，用于处理具有不同外部干扰频谱的外部干扰，如旋转振动（RV）。 每个前馈控制器被设计为对于消除特定关联的RV频谱是最佳的。 确定作用在磁盘驱动器上的实际RV频谱，然后选择适当的前馈控制器以产生用于消除RV的补偿信号。 当磁盘驱动器经历RV时，可以测试每个前馈控制器，并测量所得到的补偿信号和PES。 然后选择产生最佳外部干扰消除的前馈控制器作为前馈控制器。 可以使用来自RV传感器的信号来检测实际RV频谱的峰值频率。 然后将该检测到的峰值频率与查找表中的多个峰值频率的峰值频率相匹配，并且选择与匹配峰值频率相关联的前馈控制器作为前馈控制器。
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公开(公告)号：US07882390B2
公开(公告)日：2011-02-01
申请号：US12006407
申请日：2007-12-31
IPC分类号： G06F11/00
CPC分类号： G11B5/59633 , G11B5/59672 , G11B19/041 , G11B2220/2516
摘要： A method for repairing at least one defective servo segment of a servo sector having at least one defective servo track written on a magnetic recording media. The method comprises mapping the magnetic recording media for locations of the defective servo segment of the servo sector. A non-defective segment of the servo sector is replicated at least once on the magnetic recording media in a customer data zone, thereby creating at least one good servo segment copy of the servo sector. The good servo segment copy is propagated through the customer data zone associated with the defective servo segment. The good servo segment copy is copied onto the magnetic recording media previously occupied by the defective servo segment of the servo sector.
摘要翻译： 一种用于修复伺服扇区的至少一个缺陷伺服段的方法，该伺服扇区具有写在磁记录介质上的至少一个有缺陷的伺服轨迹。 该方法包括将磁记录介质映射到伺服扇区的缺陷伺服段的位置。 伺服扇区的无缺陷段在客户数据区中的磁记录介质上复制至少一次，由此创建伺服扇区的至少一个良好伺服段副本。 良好的伺服段复制通过与缺陷伺服段相关联的客户数据区传播。 良好的伺服段复制被复制到先前由伺服扇区的缺陷伺服段占据的磁记录介质上。
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公开(公告)号：US20090168226A1
公开(公告)日：2009-07-02
申请号：US12006407
申请日：2007-12-31
IPC分类号： G11B5/596
CPC分类号： G11B5/59633 , G11B5/59672 , G11B19/041 , G11B2220/2516
摘要： A method for repairing at least one defective servo segment of a servo sector having at least one defective servo track written on a magnetic recording media. The method comprises mapping the magnetic recording media for locations of the defective servo segment of the servo sector. A non-defective segment of the servo sector is replicated at least once on the magnetic recording media in a customer data zone, thereby creating at least one good servo segment copy of the servo sector. The good servo segment copy is propagated through the customer data zone associated with the defective servo segment. The good servo segment copy is copied onto the magnetic recording media previously occupied by the defective servo segment of the servo sector.
摘要翻译： 一种用于修复伺服扇区的至少一个缺陷伺服段的方法，该伺服扇区具有写在磁记录介质上的至少一个有缺陷的伺服轨迹。 该方法包括将磁记录介质映射到伺服扇区的缺陷伺服段的位置。 伺服扇区的无缺陷段在客户数据区中的磁记录介质上复制至少一次，由此创建伺服扇区的至少一个良好伺服段副本。 良好的伺服段复制通过与缺陷伺服段相关联的客户数据区传播。 良好的伺服段复制被复制到先前由伺服扇区的缺陷伺服段占据的磁记录介质上。
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6.发明授权Disk drive using a disturbance sensor for disturbance frequency-identification and suppression 有权磁盘驱动器使用干扰传感器进行干扰频率识别和抑制公开(公告)号：US07345841B2
公开(公告)日：2008-03-18
申请号：US11349774
申请日：2006-02-07
IPC分类号： G11B21/02
CPC分类号： G11B5/5582 , G11B5/59622
摘要： A magnetic recording disk drive has a disturbance sensor and a disturbance frequency identifier that are used to adjust the frequency of a peak filter as the disturbance frequency changes. The sensor and the frequency identifier are separate from the servo control loop and thus do not rely on the head position error signal (PES) to predict the disturbance frequency. The adjustable peak filter is coupled in parallel with the servo feedback controller. The peak filter modifies the open loop transfer function and the error rejection function of the servo control loop to provide a higher rejection at the identified frequency. The peak filter may be switched out of or uncoupled from the servo feedback controller during track-seeking or as desired, depending on the amplitude of the sensor signal or the amplitude of the PES.
摘要翻译： 磁记录盘驱动器具有干扰传感器和干扰频率标识符，用于随着扰动频率的变化来调整峰值滤波器的频率。 传感器和频率标识符与伺服控制环分开，因此不依赖于头位置误差信号（PES）来预测扰动频率。 可调峰值滤波器与伺服反馈控制器并联耦合。 峰值滤波器修改开环传递函数和伺服控制回路的误差抑制功能，以在识别的频率提供更高的抑制。 根据传感器信号的幅度或PES的振幅，峰值滤波器可以在跟踪寻找期间或根据需要从伺服反馈控制器切换或分离。
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7.发明授权Dual-stage actuator disk drive with secondary actuator failure detection and recovery using relative-position signal 失效双级执行器磁盘驱动器，辅助执行器故障检测和恢复使用相对位置信号公开(公告)号：US07072134B1
公开(公告)日：2006-07-04
申请号：US11051392
申请日：2005-02-03
IPC分类号： G11B5/02
CPC分类号： G11B5/5552
摘要： A dual-stage actuator disk drive uses a secondary-actuator failure-detection and calibration test run by the servo control processor and a relative-position sensor for measuring the position of the secondary actuator relative to its neutral position in response to the calibration test. The secondary-actuator failure detection and calibration test can be performed on a regular schedule or at selected times, such as at disk drive start-up. With the primary actuator biased at a test location, such as a crash stop or a load/unload ramp, the servo control processor generates a test signal to the secondary actuator and receives a relative-position signal (RPS) from the relative-position sensor in response to the test signal. The test comprises two measurements: a measurement of the secondary actuator static characteristics, and a measurement of the secondary actuator dynamic characteristics.
摘要翻译： 双级致动器盘驱动器使用由伺服控制处理器和相对位置传感器执行的二次执行器故障检测和校准测试，用于响应于校准测试来测量辅助执行器相对于其中性位置的位置。 二次执行器故障检测和校准测试可以按照时间表或选定的时间进行，例如在磁盘驱动器启动时执行。 当主执行器偏置在测试位置（例如碰撞停止或装载/卸载斜坡）时，伺服控制处理器向次级致动器产生测试信号，并从相对位置传感器接收相对位置信号（RPS） 响应测试信号。 该测试包括两个测量：次级致动器静态特性的测量以及辅助致动器动态特性的测量。
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8.发明授权Disk drive with capacitance sensing of disk vibration and feedforward control for removal of read/write head track misregistration 失效磁盘驱动器具有磁盘振动和前馈控制的电容感测，用于去除读/写磁头轨迹重合失调公开(公告)号：US07012777B1
公开(公告)日：2006-03-14
申请号：US10956908
申请日：2004-09-30
申请人： Toshiki Hirano , Tetsuo Semba , Matthew T. White
发明人： Toshiki Hirano , Tetsuo Semba , Matthew T. White
IPC分类号： G11B5/596
CPC分类号： G11B5/00 , G11B5/59627
摘要： A data recording disk drive has a plurality of capacitive sensors, each sensor facing a surface of an associated disk, a capacitance sensing circuit for converting the sensed capacitance to a voltage representative of the distance between the sensor and the disk surface, and a feedforward controller that receives the voltage signal. The feedforward controller has a transfer function with gain and phase characteristics designed to match the transfer function from the out-of-plane disk vibration to the position of the read/write head while accounting for the effects of the sensor dynamics and the dynamics of the actuator. The output from the feedforward controller is combined with the output from the disk drive's servo feedback controller so that the effects of disk vibration on track misregistration of the head are removed from the control signal to the actuator.
摘要翻译： 数据记录盘驱动器具有多个电容传感器，每个传感器面对相关盘的表面，用于将检测到的电容转换为表示传感器和盘表面之间的距离的电压的电容感测电路，以及前馈控制器 接收电压信号。 前馈控制器具有传递函数，其增益和相位特性被设计成将传播函数从平面外盘振动到读/写头的位置相匹配，同时考虑到传感器动力学和动力学的影响 执行器。 来自前馈控制器的输出与磁盘驱动器的伺服反馈控制器的输出相结合，使得磁盘振动对磁头的磁道重合失调的影响从控制信号中移除到执行机构。
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公开(公告)号：US06583964B1
公开(公告)日：2003-06-24
申请号：US09272941
申请日：1999-03-18
IPC分类号： G11B2110
CPC分类号： G11B5/4833 , G11B5/4813 , G11B33/08
摘要： A disk drive having an arm assembly equipped with a primary actuator such as a VCM and a mode-canceling actuator such as a PZT mounted at a location selected in such a way that the strain in the mode-canceling actuator is in phase with sway deformations of the primary actuator produced by the vibrational modes of the arm assembly. The primary actuator is driven to exert a primary force, f ⋁ pm , on the arm assembly while the secondary driver ensures that the mode-canceling actuator applies a mode-canceling force, f ⋁ m c , on arm assembly such that the gain and phase of one or more vibrational modes are canceled.
摘要翻译： 具有臂组件的盘驱动器，其具有诸如VCM的主要致动器和诸如PZT的模式消除致动器，其安装在以使得模式消除致动器中的应变与摇摆变形相同的位置 通过臂组件的振动模式产生的主致动器。 主辅助致动器被驱动以在臂组件上施加一次力，而次级驾驶员确保模式消除致动器在臂组件上施加减震力，使得一个或多个振动模式的增益和相位被取消 。
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公开(公告)号：US07450335B2
公开(公告)日：2008-11-11
申请号：US11502069
申请日：2006-08-09
申请人： Toshiki Hirano , Tetsuo Semba , Matthew T. White
发明人： Toshiki Hirano , Tetsuo Semba , Matthew T. White
IPC分类号： G11B5/596
CPC分类号： G11B5/59627 , G11B5/6017
摘要： Methods and systems for reducing read/write head track misregistration are described. According to one embodiment, a first signal is received from a first capacitive sensor that faces a surface of a disk associated with a disk drive. A second signal is received from a second capacitive sensor that faces the surface of the disk. A determination is made as to whether the disk is being moved along its axis of rotation or whether the disk is tilting. Read/write head track misregistration is reduced based on the determination of whether the disk drive is being moved along an axis of rotation or whether the disk is tilting.
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