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1.发明授权Partitioning disc drive read/write electronics to improve data transfer performance 有权分区磁盘驱动器读/写电子设备，以提高数据传输性能公开(公告)号：US06687066B1
公开(公告)日：2004-02-03
申请号：US09510442
申请日：2000-02-21
申请人： Hieu Van Nguyen
发明人： Hieu Van Nguyen
IPC分类号： G11B509
CPC分类号： G11B20/10481 , G11B5/012 , G11B5/02 , G11B5/09 , G11B20/10009 , G11B2005/0013
摘要： Apparatus in a disc drive for transferring data between a rotatable disc and a host computer. An analog pre-processor integrated circuit device incorporates circuitry to carry out analog processing functions including write current driving, readback signal amplification, prewrite compensation, frequency-domain filtering, and equalization. A digital post-processor integrated circuit device incorporates circuitry to carry out digital signal processing functions including Viterbi detection, decoding, error detection and correction, buffering, host interface functions, and data encoding and serialization. The analog pre-processor is preferably mounted within the interior environment of the disc drive to an actuator assembly that supports a head adjacent the disc. The digital post-processor is preferably supported on a printed circuit board mounted to an exterior surface of the disc drive.
摘要翻译： 用于在可旋转盘和主计算机之间传送数据的盘驱动器中的装置。 模拟预处理器集成电路器件包含执行模拟处理功能的电路，包括写入电流驱动，回读信号放大，预写补偿，频域滤波和均衡。 数字后处理器集成电路器件包括用于执行数字信号处理功能的电路，包括维特比检测，解码，错误检测和校正，缓冲，主机接口功能以及数据编码和串行化。 模拟预处理器优选地安装在盘驱动器的内部环境中，以支持邻近盘的头部的致动器组件。 数字后处理器优选地被支撑在安装到盘驱动器的外表面的印刷电路板上。
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2.发明授权公开(公告)号：US06532126B1
公开(公告)日：2003-03-11
申请号：US09639211
申请日：2000-08-15
IPC分类号： G11B1512
CPC分类号： G11B5/02 , G11B5/012 , G11B5/40 , G11B15/12 , G11B15/125 , G11B2005/0018
摘要： An apparatus and method are disclosed for minimizing damage to a disc drive during head switching operations. The disc drive comprises a plurality of magnetic recording surfaces to and from which data are transferred using read/write heads, each head utilizing the application of a bias current during operation. To switch from a presently selected head to a target head, the disc drive determines a first value indicative of the magnitude of a bias current for the presently selected head and a target bias current to be applied to the target head. When the second value is greater than the first value, the disc drive switches from the presently selected head to the target head and then applies the target bias current; conversely, when the first value is greater than the second value, the target bias current is applied to the presently selected head and then the disc drive switches from the presently selected head to the target head.
摘要翻译： 公开了一种用于在磁头切换操作期间最小化对磁盘驱动器的损坏的装置和方法。 磁盘驱动器包括多个磁记录表面，从而从读数/写头读取/写入数据，每个磁头在运行期间利用偏置电流的应用。 为了从当前选择的头切换到目标头，盘驱动器确定指示当前选择的头的偏置电流的大小的第一值和要施加到目标头的目标偏置电流。 当第二值大于第一值时，盘驱动器从当前选择的头切换到目标头，然后施加目标偏置电流; 相反，当第一值大于第二值时，目标偏置电流被施加到当前选择的磁头，然后磁盘驱动器从当前选择的磁头切换到目标磁头。
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公开(公告)号：US6115201A
公开(公告)日：2000-09-05
申请号：US40667
申请日：1998-03-18
CPC分类号： G11B5/012 , G11B19/04 , G11B5/40 , G11B5/455 , G11B2005/0018 , G11B5/035 , G11B5/5534
摘要： An apparatus and method are disclosed for determining a maximum magnitude of bias current that can be safely applied to a head of a disc drive. The disc drive comprises a head disposed adjacent a rotatable disc having a recording surface on which data are magnetically stored, a preamplifier circuit which selectively applies bias currents to the head, and a head bias current selection circuit, operably coupled to the preamplifier circuit, which first determines the maximum magnitude of bias current that can be applied to the head in relation to a maximum power dissipation rating of the head and voltage measured across the head when at least one initial bias current of selected magnitude is applied to the head. Thereafter, a range of bias currents having different magnitudes less than or equal to the maximum magnitude are selected and evaluated to select an optimum magnitude for subsequent use by the drive.
摘要翻译： 公开了用于确定可以安全地施加到盘驱动器的头部的偏置电流的最大幅度的装置和方法。 磁盘驱动器包括一个与可旋转磁盘相邻设置的磁头，磁头具有数据被磁性存储的记录表面，选择性地向磁头施加偏置电流的前置放大器电路和可操作地耦合到前置放大器电路的磁头偏置电流选择电路， 当至少一个选定幅度的初始偏置电流施加到磁头时，首先确定可以施加到磁头的偏置电流的最大幅度相对于在头部测量的磁头和电压的最大功率损耗等级。 此后，选择并且评估具有小于或等于最大幅度的不同幅度的偏置电流范围，以选择用于驱动器后续使用的最佳量值。
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公开(公告)号：US6141165A
公开(公告)日：2000-10-31
申请号：US040795
申请日：1998-03-18
CPC分类号： G11B5/02 , G11B15/12 , G11B15/125 , G11B5/012 , G11B2005/0018 , G11B5/40
摘要： An apparatus and method are disclosed for minimizing damage to a disc drive during head switching operations. The disc drive comprises a plurality of magnetic recording surfaces to and from which data are transferred using read/write heads, each head utilizing the application of a bias current during operation. To switch from a presently selected head to a target head, the disc drive determines a first value indicative of the magnitude of a bias current for the presently selected head and a target bias current to be applied to the target head. When the second value is greater than the first value, the disc drive switches from the presently selected head to the target head and then applies the target bias current; conversely, when the first value is greater than the second value, the target bias current is applied to the presently selected head and then the disc drive switches from the presently selected head to the target head.
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公开(公告)号：US11100115B1
公开(公告)日：2021-08-24
申请号：US15905481
申请日：2018-02-26
IPC分类号： G06F16/25 , G06Q40/00 , G06F16/2457 , G06F16/9535 , G06F40/174
摘要： A method may include obtaining forms each including fields each including field metadata, obtaining a schema including elements each including element metadata and defining constraints on a field of a form, identifying a corresponding element for each field, creating, for the field, a search result by combining the field metadata of the field and the element metadata of the corresponding element, adding the search result to a search results repository, receiving, from a user, a search query, in response to receiving the search query, determining, using the search results repository, search results, and ranking, using a ranking model, the search results.
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