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1. 发明授权

US5579186A Magnetic disk unit and method for controlling the same 失效
标题翻译：磁盘单元及其控制方法
公开(公告)号：US5579186A
公开(公告)日：1996-11-26
申请号：US416587
申请日：1995-04-03
申请人： Satoshi Yamamoto , Akira Shinjoh , Isao Yoneda , Arun Sharma , Muthuthamby Sri-Jayantha , Hien P. Dang
发明人： Satoshi Yamamoto , Akira Shinjoh , Isao Yoneda , Arun Sharma , Muthuthamby Sri-Jayantha , Hien P. Dang
IPC分类号： G11B21/10 , G11B5/55 , G11B5/596 , G11B5/02
CPC分类号： G11B5/5543 , G11B5/59655 , G11B5/5547
摘要： In an idle state, servo information from all sectors is not used, but the servo information from every other sector or from every three or more sectors is used so that head positioning can be performed with only a minimum amount of servo information. The power to the electric circuitry of a write or read system and a servo system, which is not needed in the idle state, is interrupted, from the arrival of the selected servo information to the arrival of the next selected servo information, by a power control signal generated in accordance with the timing of the sectors. The power consumption can be reduced by the amount corresponding to turning off the circuitry not needed, plus the amount needed for computing for position control.
摘要翻译：在空闲状态下，不使用来自所有扇区的伺服信息，而是使用来自每个其他扇区或每三个或更多个扇区的伺服信息，以便只能以最小量的伺服信息执行磁头定位。在空闲状态下不需要的写入或读取系统和伺服系统的电路的电力从所选择的伺服信息的到达到下一个所选择的伺服信息的到达被中断，控制信号根据扇区的时序产生。功耗可以减少对应于关闭不需要的电路的数量，加上用于位置控制的计算所需的量。

2. 发明授权

US5608586A Robust servo for disk-shift compensation in rotating storage system 失效
标题翻译：用于旋转存储系统中的磁盘移位补偿的鲁棒伺服
公开(公告)号：US5608586A
公开(公告)日：1997-03-04
申请号：US327168
申请日：1994-10-21
申请人： Muthuthamby Sri-Jayantha , Arun Sharma , Hien Dang , Satoshi Yamamoto
发明人： Muthuthamby Sri-Jayantha , Arun Sharma , Hien Dang , Satoshi Yamamoto
IPC分类号： G11B5/55 , G11B5/596 , G11B5/035
CPC分类号： G11B5/5547 , G11B5/59627
摘要： A method and apparatus, in a direct access storage device including a head positioned for interaction with a data storage medium mounted on a rotating spindle, an actuator for positioning the head, and a servo control loop for positioning the actuator. The improvement comprises: a narrow band gain enhancing filter for connection in the servo control loop. The filter has a response frequency related to the rotational frequency of the spindle. The filter has programmable initial states. Also provided is a switch for switching in the narrow band filter as the head approaches a target position on the data storage medium. Initial states of the filter are determined and supplied to program the filter. At least one additional filter having a peak response frequency at a harmonic of the frequency of rotation of the spindle, may be provided. Initial states of the additional filters are determined and supplied to program the additional filter. The filter may include successive delay circuits for inputs to the filter, which circuits provide delayed outputs; multipliers for multiplying selected delayed outputs by a constant; and a summer for summing the delay outputs after the delayed outputs are multiplied by the multipliers. The initial states may be stored as phase, frequency and amplitude of a sine function.
摘要翻译：一种直接存取存储装置中的方法和装置，包括：定位用于与安装在旋转主轴上的数据存储介质相互作用的头部，用于定位头部的致动器，以及用于定位致动器的伺服控制回路。改进包括：用于在伺服控制回路中连接的窄带增益增强滤波器。滤波器具有与主轴转速相关的响应频率。滤波器具有可编程的初始状态。还提供了当头部接近数据存储介质上的目标位置时用于切换窄带滤波器的开关。滤波器的初始状态被确定并提供给编程滤波器。可以提供至少一个具有在主轴的旋转频率的谐波处的峰值响应频率的附加滤波器。确定并提供附加过滤器的初始状态以编程附加过滤器。滤波器可以包括用于输入到滤波器的连续延迟电路，这些电路提供延迟的输出; 用于将选定的延迟输出乘以常数的乘法器; 以及用于将延迟输出乘以乘法器之后的延迟输出相加的加法器。初始状态可以存储为正弦函数的相位，频率和幅度。

3. 发明授权

US5901009A Reduced seek acoustic noise direct access storage device 失效
标题翻译：减少寻呼声噪声直接存取存储设备
公开(公告)号：US5901009A
公开(公告)日：1999-05-04
申请号：US455806
申请日：1995-05-31
申请人： Muthuthamby Sri-Jayantha , Arun Sharma , Satoshi Yamamoto
发明人： Muthuthamby Sri-Jayantha , Arun Sharma , Satoshi Yamamoto
IPC分类号： G11B5/55
CPC分类号： G11B5/5547
摘要： A disk drive with reduced seek acoustic noise and a method for implementation, without any additional hardware or mechanical modifications to the actuator includes a filter such that servo-loop stability is unaffected. The filter is inserted outside the existing servo loop to reshape the existing velocity profile in real time and to facilitate the suppression of forcing components that produce seek acoustics. A weighting factor may be used to provide a weighted average of the filtered and unfiltered velocity reference signal to the servo loop so that at the end of a track seek operation, the unfiltered reference signal is applied to the velocity servo, and there is almost no change in settle-out performance when the target track is reached. It is not necessary to store large volumes of velocity profile data to deal with different seek lengths.
摘要翻译：具有减小的寻呼声噪声的磁盘驱动器和实现方法，而没有对致动器的任何额外的硬件或机械修改包括使得伺服环路稳定性不受影响的滤波器。滤波器被插入到现有的伺服环路外部，以实时重新形成现有的速度分布图，并有助于抑制产生寻道声学的强制元件。可以使用加权因子来提供经滤波和未滤波的速度参考信号到伺服环路的加权平均值，使得在轨道搜索操作结束时，未过滤的参考信号被施加到速度伺服机构，并且几乎没有当达到目标轨道时，改变稳定性能。不需要存储大量的速度曲线数据来处理不同的寻道长度。

4. 发明授权

US06532129B1 Method and apparatus for sustaining feedback filter state having periodic output 失效
标题翻译：用于维持具有周期性输出的反馈滤波器状态的方法和装置
公开(公告)号：US06532129B1
公开(公告)日：2003-03-11
申请号：US09330180
申请日：1999-06-11
申请人： Sri Muthuthamby Sri-Jayantha , Hien P. Dang , Arun Sharma , Isao Yoneda , Nobuyuki Kitazaki
发明人： Sri Muthuthamby Sri-Jayantha , Hien P. Dang , Arun Sharma , Isao Yoneda , Nobuyuki Kitazaki
IPC分类号： G11B5596
CPC分类号： G11B5/59627
摘要： A disk drive system, includes a head, a controller for controlling an operation of the head, at least one feedback filter coupled in relation to the controller, and a mechanism for keeping a function of the at least one of the feedback filter active during any of an absence of a valid position error signal (PES) and a position error signal being unavailable due to a defect during an operation of the head.
摘要翻译：磁盘驱动器系统包括磁头，用于控制磁头的操作的控制器，相对于控制器耦合的至少一个反馈滤波器，以及用于保持反馈滤波器中的至少一个功能在任何没有有效位置误差信号（PES）和位置误差信号由于在头部的操作期间的缺陷而不可用。

5. 发明授权

US5270880A Predictive read-write inhibit decision using fuzzy logic 失效
标题翻译：使用模糊逻辑预测读写禁止判定
公开(公告)号：US5270880A
公开(公告)日：1993-12-14
申请号：US866687
申请日：1992-04-10
申请人： Hal H. Ottesen , Arun Sharma , Muthuthamby Sri-Jayantha
发明人： Hal H. Ottesen , Arun Sharma , Muthuthamby Sri-Jayantha
IPC分类号： G11B5/09 , G11B19/02 , G11B19/04 , G11B20/10 , G11B20/18 , G11B21/10 , G11B15/04
CPC分类号： G11B19/02 , G11B19/04
摘要： A method for predicting and avoiding data errors by predicting disk drive read-write inhibit requirements in response to at least two parameters including a head position error and velocity with respect to the track centerline. A write or read inhibit signal is generated in response to selected combinations of these parameters to minimize soft read errors arising from track misregistration and to avoid hard errors arising from overwriting data recorded in an adjacent track. The read and write inhibit strategy is described as a pair of linguistic control rules suitable for implementation in a Fuzzy Logic Controller.

6. 发明授权

US6097565A Repeatable runout free servo architecture in direct access storage device 失效
标题翻译：可重复跳出自由伺服架构在直接存取存储设备
公开(公告)号：US6097565A
公开(公告)日：2000-08-01
申请号：US594572
申请日：1996-01-31
申请人： Muthuthamby Sri-Jayantha , Arun Sharma , Hien Dang , Hirouki Suzuki
发明人： Muthuthamby Sri-Jayantha , Arun Sharma , Hien Dang , Hirouki Suzuki
IPC分类号： G11B21/10 , G11B5/596
CPC分类号： G11B5/59627
摘要： In a direct access storage device including a rotating disk, a head positioned for interaction with said disk, an actuator for carrying said head and a servo system for operating said actuator so as to follow a substantially circular track on said disk by responding to a position error signal, a method for reducing response of the servo system to radial runout of the circular tracks, comprising the steps of obtaining radial runout data; filtering the data; storing the filtered data; subtracting the filtered data from the position error signal to obtain a corrected position error signal; and using the corrected position error signal to control the servo system. A direct access storage device in accordance with the invention includes means for obtaining radial runout data; means for filtering the data; means for storing the filtered data; means for subtracting the filtered data from the position error signal to obtain a corrected position error signal; and means for controlling the servo system using the corrected position error signal.
摘要翻译：在包括旋转盘的直接存取存储装置中，用于与所述盘相互作用的头部，用于承载所述头部的致动器和用于操作所述致动器的伺服系统，以便通过响应于位置误差信号，用于减小伺服系统对圆形轨道的径向跳动的响应的方法，包括以下步骤：获得径向跳动数据; 过滤数据; 存储经过滤的数据; 从位置误差信号中减去滤波后的数据，得到校正后的位置误差信号; 并使用校正的位置误差信号来控制伺服系统。根据本发明的直接存取存储装置包括用于获得径向跳动数据的装置; 用于过滤数据的手段; 用于存储经过滤数据的装置; 用于从所述位置误差信号中减去所述滤波数据以获得校正的位置误差信号的装置; 以及用于使用校正的位置误差信号来控制伺服系统的装置。

7. 发明授权

US5381282A Inter-sample switching of servo control in direct access storage devices 失效
标题翻译：直接存取存储设备中伺服控制的采样间切换
公开(公告)号：US5381282A
公开(公告)日：1995-01-10
申请号：US779438
申请日：1991-10-18
申请人： Koichi Arai , Hal H. Ottesen , Arun Sharma , Muthuthamby Sri-Jayantha , Michael C. Stich
发明人： Koichi Arai , Hal H. Ottesen , Arun Sharma , Muthuthamby Sri-Jayantha , Michael C. Stich
IPC分类号： G11B21/08 , G11B5/596
CPC分类号： G11B5/596
摘要： A direct access storage device and a method of operation thereof where the output of the circuit which controls energy to the position actuator for the head may be changed at times between receipt of sequential position error signals from the medium. Instead of waiting for the next position error signal, a computation is done based on at least the current position and the desired position of the head as to when the head velocity will be equal to a desired velocity. The optimum time to switch is estimated, the energy required to achieve a predetermined velocity and a predetermined offset with respect to the desired position are computed, and operation is conducted accordingly. The amount of energy may again be changed at a time subsequent to the estimated time. The predetermined velocity and the predetermined offset may be zero or may have values other than zero in accordance with the requirements of the track following controller.
摘要翻译：一种直接存取存储装置及其操作方法，其中可以在接收到来自介质的连续位置误差信号之间的时候改变控制头部位置致动器的能量的电路的输出。代替等待下一个位置误差信号，至少基于头部的当前位置和期望位置来计算关于头部速度将等于期望速度的时间。估计最佳切换时间，计算实现预定速度所需的能量和相对于期望位置的预定偏移量，并相应地进行操作。在估计时间之后的时间，能量的量再次可以改变。预定速度和预定偏移可以为零，或者可以根据跟踪跟踪控制器的要求具有除零之外的值。

8. 发明授权

US06549349B2 Adaptive vibration control for servo systems in data storage devices 失效
标题翻译：数据存储设备伺服系统的自适应振动控制
公开(公告)号：US06549349B2
公开(公告)日：2003-04-15
申请号：US09955391
申请日：2001-09-18
申请人： Sri Muthuthamby Sri-Jayantha , Arun Sharma , Hien Phu Dang , Naoyuki Kagami , Yuzo Nakagawa , Akira Tokizono , Isao Yoneda
发明人： Sri Muthuthamby Sri-Jayantha , Arun Sharma , Hien Phu Dang , Naoyuki Kagami , Yuzo Nakagawa , Akira Tokizono , Isao Yoneda
IPC分类号： G11B2736
CPC分类号： G11B21/106 , G11B5/59611
摘要： Methods and systems for detecting and correcting for undesirable vibrations impacting the servo systems in data storage devices. A detection technique is provided wherein a detection filter is configured to scan a position signal of the servo system across a range of frequencies, and, at each respective scanned frequency, record an amplitude associated therewith. The recorded amplitudes are examined to determine whether any exceed a threshold, thereby locating a peak frequency of the vibration. Using the detected peak frequency of the vibration, a corrective filter is configured to operate about the peak frequency of vibration, thereby reducing its impact on the position signal in the servo system. Optimum detection and correction filter structures are disclosed, as are techniques for addressing filter state vectors as initial conditions as the corrective filters are repeatedly engaged during successive settle-out and track follow cycles (between seeks), as are continuous adaptation techniques for changing vibration environments.
摘要翻译：用于检测和校正影响数据存储设备中的伺服系统的不期望的振动的方法和系统。提供了一种检测技术，其中检测滤波器被配置为扫描频率范围内的伺服系统的位置信号，并且在每个相应的扫描频率处记录与之相关联的振幅。检查记录的振幅以确定是否有超过阈值，从而定位振动的峰值频率。使用检测到的振动峰值频率，校正滤波器被配置为围绕振动的峰值频率运行，从而减小其对伺服系统中位置信号的影响。公开了最佳检测和校正滤波器结构，作为用于将滤波器状态向量寻址作为初始条件的技术，校正滤波器在连续的稳定和跟踪周期（寻找之间）期间重复接合），以及用于改变振动环境的连续自适应技术。

9. 发明授权

US06181507B2 Increased and randomized output sampling to reduce positioning noise in a data storage system 失效
标题翻译：增加和随机输出采样，以减少数据存储系统中的定位噪声
公开(公告)号：US06181507B2
公开(公告)日：2001-01-30
申请号：US08692164
申请日：1996-08-05
申请人： Nobuyuki Kitazaki , Kiyoshi Satoh , Arun Sharma , Sri Muthuthamby Sri-Jayantha , Isao Yoneda
发明人： Nobuyuki Kitazaki , Kiyoshi Satoh , Arun Sharma , Sri Muthuthamby Sri-Jayantha , Isao Yoneda
IPC分类号： G11B5596
CPC分类号： G11B5/59605 , G11B5/59627 , G11B5/5965
摘要： A method and system for reducing positioning noise in a data storage system are provided. An access device is positioned over a data storage medium using a stream of bursts stored on the medium. The bursts are sensed at a frequency determined by the rate at which the medium is moved relative to a sensing device. Output positioning values are provided to position the access device at a frequency higher than the frequency at which the positioning bursts are sensed, and/or at random times. The random times may be calculated as random advances or delays from time points occurring at a fixed frequency.
摘要翻译：提供了一种用于降低数据存储系统中的定位噪声的方法和系统。访问设备使用存储在介质上的突发流来定位在数据存储介质上。以由介质相对于感测装置移动的速率确定的频率感测脉冲串。提供输出定位值以将访问设备定位在高于感测定位脉冲串的频率的频率处和/或随机时间。随机时间可以被计算为在固定频率发生的时间点的随机前进或延迟。

10. 发明授权

US5761006A Direct access storage device having compound actuator bearing system 失效
标题翻译：具有复合致动器轴承系统的直接存取存储装置
公开(公告)号：US5761006A
公开(公告)日：1998-06-02
申请号：US764772
申请日：1996-12-12
申请人： Muthuthamby Sri-Jayantha , Arun Sharma , Suresh Kumar , Vijayeshwar Khanna
发明人： Muthuthamby Sri-Jayantha , Arun Sharma , Suresh Kumar , Vijayeshwar Khanna
IPC分类号： G11B21/02 , F16C21/00 , G11B5/55 , G11B21/08 , G11B21/10
CPC分类号： G11B21/08 , F16C21/00 , G11B21/083 , G11B5/5521 , G11B5/5552 , F16C2370/12 , G11B5/5582
摘要： In a direct access storage device having a head for interaction with a storage medium and a moving actuator on which the head is mounted, the improvement comprises a compound bearing system for the actuator, the bearing system including a first bearing of low friction for small movements of the actuator; and a second bearing of higher friction for coarse movements of the actuator. The storage medium is preferably a rotating magnetic disk having a series of concentric circular tracks. A single servo system drives the actuator so that the head follows a selected track with motion of the first bearing, and movement of the head to a new track causes motion of the second bearing. Preferably the first bearing is a flex bearing and the second bearing is a ball bearing.
摘要翻译：在具有用于与存储介质相互作用的头部和安装有头部的移动致动器的直接存取存储装置中，改进包括用于致动器的复合轴承系统，该轴承系统包括用于小运动的低摩擦力的第一轴承的执行器; 以及用于致动器的粗略运动的较高摩擦力的第二轴承。存储介质优选地是具有一系列同心圆形轨道的旋转磁盘。单个伺服系统驱动致动器，使得头部沿着第一轴承的运动跟随选定的轨道，并且头部移动到新的轨道导致第二轴承的运动。优选地，第一轴承是挠性轴承，第二轴承是球轴承。

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