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公开(公告)号：US11978489B1
公开(公告)日：2024-05-07
申请号：US18319984
申请日：2023-05-18
发明人： Jake Asmus , Larry LeeRoy Tretter
CPC分类号： G11B5/397 , G11B5/03 , G11B2005/0018
摘要： A computer program product, system, and method are provided for direct resistance measurement of a magnetoresistive (MR) head of a storage drive in a storage system. In one embodiment, a voltage difference across the MR reader head is measured directly by applying an AC current to the MR head to generate an AC voltage across the MR head that can propagate through filter capacitors and be measured. In one embodiment, the voltage difference is amplified and the peak-to-peak voltage at the output of the amplifier is captured. Similarly, a reference voltage difference across a reference resistance is measured directly by applying a reference AC current to a reference resistance. The resistance of an MR reader head may be calculated directly as a function of the respective voltage differences without including the resistance of any bias resistors biasing the MR head.
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公开(公告)号：US11341989B2
公开(公告)日：2022-05-24
申请号：US17039038
申请日：2020-09-30
摘要： Systems and methods are disclosed for dynamically adjusting parameters used during a read operation to reduce stress on a read head. In certain embodiments, an apparatus may comprise a read head configured to read data stored to a data storage medium, and a control circuit that controls a parameter of the read head influencing the read head's ability to accurately read data. The control circuit may be configured to extend the working lifespan of the read head by monitoring a read performance of the read head, and adjusting the parameter to reduce the read performance when the read performance is greater than a first threshold.
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公开(公告)号：US20220101875A1
公开(公告)日：2022-03-31
申请号：US17039038
申请日：2020-09-30
发明人： Peter S. Harllee
摘要： Systems and methods are disclosed for dynamically adjusting parameters used during a read operation to reduce stress on a read head. In certain embodiments, an apparatus may comprise a read head configured to read data stored to a data storage medium, and a control circuit that controls a parameter of the read head influencing the read head's ability to accurately read data. The control circuit may be configured to extend the working lifespan of the read head by monitoring a read performance of the read head, and adjusting the parameter to reduce the read performance when the read performance is greater than a first threshold.
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4.发明授权Magnetic recording disk drive with write current overshoot amplitude (OSA) responsive to data transitions 有权具有响应数据转换的写入电流过冲幅度（OSA）的磁记录磁盘驱动器公开(公告)号：US09111561B1
公开(公告)日：2015-08-18
申请号：US14526336
申请日：2014-10-28
CPC分类号： G11B5/59616 , G11B5/02 , G11B20/10018
摘要： A disk drive dynamic wave shaper (DWS) write driver includes a write current generator that produces a baseline output current for the write current pulses and an overshoot current generator that produces an overshoot current with different values. The overshoot current is added to the baseline current, with the value of the overshoot current amplitude (OSA) being selected in response to the frequency of transitions in the write data signal. The write driver includes logic circuitry that detects the pattern of transitions. Transitions that are immediately followed by a transition will receive a larger-than-nominal OSA1, transitions that are not immediately followed by a transition and that are not preceded by a long sequence of non-transitions will receive a nominal OSA2, and transitions after longer sequences of non-transitions will receive a smaller-than-nominal OSA3.
摘要翻译： 磁盘驱动器动态波形整形器（DWS）写入驱动器包括写入电流发生器，其产生写入电流脉冲的基线输出电流和产生具有不同值的过冲电流的过冲电流发生器。 过冲电流被加到基线电流上，响应于写入数据信号中的转换频率来选择过冲电流幅度（OSA）的值。 写驱动器包括检测转换模式的逻辑电路。 紧随其后的转换将接收到大于标称的OSA1，不是紧随其后的过渡的转换，而不是长时间的非转换序列将接收标称的OSA2，并且在更长时间后转换 非转换序列将接收到小于标称的OSA3。
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公开(公告)号：US08988815B2
公开(公告)日：2015-03-24
申请号：US14271616
申请日：2014-05-07
CPC分类号： G11B5/00813 , G11B5/40 , G11B2005/0018
摘要： Magnetoresistive (MR) bias is dynamically controlled in a tape drive using a processor device. Median tape head amplitude is monitored during a calibration operation, as measured across all tracks of the tape head, against predetermined thresholds of the tape drive for determining if the median tape head amplitude is below the threshold value. Upon determining the median tape head amplitude is below the threshold value during the calibration operation, a reference MR bias and a MR bias range is dynamically adjusted, during the calibration operation, for increasing the median tape head amplitude.
摘要翻译： 使用处理器设备在磁带驱动器中动态地控制磁阻（MR）偏置。 在校准操作期间，在磁带头的所有磁道上测量的磁带幅度的中值幅度与磁带驱动器的预定阈值相对应，以便确定中间磁头幅度是否低于阈值。 在校准操作期间确定磁头幅度的中位数低于阈值时，在校准操作期间，动态地调整参考MR偏置和MR偏置范围，以增加磁头幅值的中值。
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公开(公告)号：US08983789B1
公开(公告)日：2015-03-17
申请号：US13182883
申请日：2011-07-14
申请人： Thart Fah Voo
发明人： Thart Fah Voo
CPC分类号： G01R35/005 , G11B2005/0018
摘要： A bias calibration circuit includes a first current source that can provide a majority biasing current, sufficient to provide most but not all of a desired bias voltage across a sensor. A second current source can provide a remaining amount of biasing current (minority biasing current) to provide a bias voltage across the sensor. In some embodiments, the current sources are programmable and codes are determined for programming the first and second current sources. The codes can be stored in a memory.
摘要翻译： 偏置校准电路包括可以提供多数偏置电流的第一电流源，足以在传感器上提供大部分但不是全部所需的偏置电压。 第二电流源可以提供剩余量的偏置电流（少数偏置电流）以在传感器两端提供偏置电压。 在一些实施例中，电流源是可编程的，并且确定代码以对第一和第二电流源进行编程。 代码可以存储在内存中。
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7.发明授权公开(公告)号：US08947821B1
公开(公告)日：2015-02-03
申请号：US14334369
申请日：2014-07-17
IPC分类号： G11B5/03
CPC分类号： G11B5/584 , G11B5/5926 , G11B20/10 , G11B20/10009 , G11B20/10037 , G11B20/10046 , G11B20/1201 , G11B2005/0013 , G11B2020/1281
摘要： According to one embodiment, a system for processing data includes an equalizer configured to use servo coefficients for processing servo data and data coefficients for processing non-servo data, wherein the equalizer includes a finite impulse response (FIR) filter configured to process data read with a magnetic tape channel using the servo coefficients to generate equalized data, one or more low-pass filters with aggressive frequency characteristics configured to filter the equalized data to output filtered data, the one or more low-pass filters with aggressive frequency characteristics being configured to remove high frequency noise from the equalized data, a peak detector configured to process peaks in a waveform of the filtered data, and at least one servo pattern detector configured to detect a servo pattern in the filtered data. Other systems and methods for processing data are described in more embodiments.
摘要翻译： 根据一个实施例，一种用于处理数据的系统包括均衡器，其被配置为使用用于处理伺服数据的伺服系数和用于处理非伺服数据的数据系数，其中均衡器包括有限脉冲响应（FIR）滤波器，其被配置为处理 使用所述伺服系数产生均衡数据的磁带通道，具有激励频率特性的一个或多个低通滤波器，其被配置为对所述均衡数据进行滤波以输出滤波数据，所述一个或多个具有积极频率特性的低通滤波器被配置为 从均衡数据中去除高频噪声，峰值检测器被配置为处理滤波数据的波形中的峰值，以及配置成检测滤波数据中的伺服模式的至少一个伺服模式检测器。 在更多实施例中描述了用于处理数据的其它系统和方法。
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公开(公告)号：US20140368946A1
公开(公告)日：2014-12-18
申请号：US13919207
申请日：2013-06-17
发明人： Andy Chou , Quan Li , Chee Wee Cheng , Beng Theam Ko , Myint Ngwe
CPC分类号： G11B5/6076 , G11B5/607
摘要： A method for detecting a contact event between a transducer and a recording medium is disclosed. The method includes positioning a transducer with respect to a recording medium, where the transducer includes a writer, a reader, a heater, and a thermally responsive sensor. The method further includes applying power to the heater to establish a fly height of the transducer; supplying a bias current through the thermally responsive sensor to generate a bias signal; measuring a root mean square (RMS) voltage VRMS of the thermally responsive sensor based on the bias signal; determining a threshold voltage VT; and detecting a contact event between the transducer and the medium based on VRMS being greater than VT.
摘要翻译： 公开了一种用于检测换能器和记录介质之间的接触事件的方法。 该方法包括相对于记录介质定位换能器，其中换能器包括写入器，读取器，加热器和热响应传感器。 该方法还包括向加热器施加电力以建立换能器的飞行高度; 通过所述热响应传感器提供偏置电流以产生偏置信号; 基于偏置信号测量热响应传感器的均方根（RMS）电压VRMS; 确定阈值电压VT; 并且基于VRMS大于VT，检测换能器和介质之间的接触事件。
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9.发明授权Disk drive performing spiral scan of disk surface to detect residual data 有权磁盘驱动器执行磁盘表面的螺旋扫描以检测残留数据公开(公告)号：US08896957B1
公开(公告)日：2014-11-25
申请号：US13922935
申请日：2013-06-20
CPC分类号： G11B5/024 , G11B5/59638
摘要： A disk drive is disclosed comprising a disk surface comprising a radius, a head operable to generate a read signal, and a voice coil motor (VCM) operable to actuate the head over the disk surface. A back electromotive force (BEMF) voltage generated by the VCM is measured. The VCM is controlled to move the head over substantially the entire radius of the disk surface in response to the BEMF voltage, and while moving the head the read signal from the head is processed to detect residual data recorded on the disk surface after erasing the disk surface.
摘要翻译： 公开了一种磁盘驱动器，其包括盘表面，该盘表面包括半径，可操作以产生读取信号的头部以及可操作以使磁头在磁盘表面上起动的音圈电机（VCM）。 测量由VCM产生的反电动势（BEMF）电压。 控制VCM以响应于BEMF电压将头部移动到基本上在盘表面的整个半径上，并且在移动头部时，处理来自头部的读取信号以在擦除盘片之后检测记录在盘表面上的残留数据 表面。
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公开(公告)号：US08824087B2
公开(公告)日：2014-09-02
申请号：US13564763
申请日：2012-08-02
申请人： Haotian Zhang , Scott Michael Dziak , Haitao Xia
发明人： Haotian Zhang , Scott Michael Dziak , Haitao Xia
IPC分类号： G11B5/03
CPC分类号： G11B5/09 , G11B2005/0008
摘要： A method and system for estimating a zero gain start (ZGS) bias in a read channel is disclosed. The method may include: receiving preamble samples within a fixed-length window selected for ZGS calculation; calculating an energy associated with a 2T frequency in the preamble samples; calculating an energy associated with non-2T frequencies in the preamble samples; and calculating the ZGS bias based on the energy associated with the 2T frequency in the preamble samples and the energy associated with non-2T frequencies in the preamble samples.
摘要翻译： 公开了一种用于估计读取通道中的零增益开始（ZGS）偏置的方法和系统。 该方法可以包括：在为ZGS计算选择的固定长度窗口内接收前导码样本; 计算在前导码样本中与2T频率相关联的能量; 计算在前导码样本中与非2T频率相关联的能量; 并且基于在前导码样本中与2T频率相关联的能量和与前同步码样本中的非2T频率相关联的能量来计算ZGS偏差。
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