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1.发明授权Disk drive for detecting a polarity error of a magnetoresistive head by detecting a sync mark 有权磁盘驱动器，用于通过检测同步标记来检测磁阻磁头的极性误差公开(公告)号：US06369969B1
公开(公告)日：2002-04-09
申请号：US09797446
申请日：2001-02-28
IPC分类号： G11B509
CPC分类号： G11B5/012 , G11B5/59683 , G11B2005/0008 , G11B2005/0018
摘要： A disk drive is disclosed comprising a bias layer in a magnetoresistive (MR) head actuated over a disk having a plurality of data tracks, each data track comprising a plurality of sectors. A sync mark detector detects a sync mark pattern in a sector, wherein when the sync mark pattern is detected a sync mark detect signal and a polarity signal are generated. The polarity signal indicates when the polarity of the bias layer has deviated from a preferred polarity, wherein the polarity of the bias layer is realigned back toward the preferred polarity.
摘要翻译： 公开了一种磁盘驱动器，其包括在具有多个数据磁道的盘上致动的磁阻（MR）磁头中的偏置层，每个数据磁道包括多个扇区。 同步标记检测器检测扇区中的同步标记图案，其中当检测到同步标记图案时，产生同步标记检测信号和极性信号。 极性信号指示偏置层的极性何时偏离优选的极性，其中偏置层的极性朝着优选的极性重新排列。
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2.发明授权Disk drive that discerns the polarity of a head signal from a sync mark to enhance data detection 有权从同步标记识别头信号的极性的磁盘驱动器，以增强数据检测公开(公告)号：US06639748B1
公开(公告)日：2003-10-28
申请号：US09796933
申请日：2001-02-28
IPC分类号： G11B509
CPC分类号： G11B27/3027 , G11B5/012 , G11B5/09 , G11B5/59616 , G11B2220/20
摘要： The present invention may be regarded as a disk drive comprising a disk having a plurality of data tracks, each data track comprising a plurality of sectors. A sync mark detector detects a sync mark pattern in a sector, wherein when the sync mark pattern is detected a sync mark detect signal and a polarity signal are generated. The polarity signal represents an expected polarity of pulses in a read signal representing data stored in the sector, wherein the polarity signal enhances the detection of an estimated data sequence from the read signal.
摘要翻译： 本发明可以被认为是包括具有多个数据磁道的磁盘的磁盘驱动器，每个数据磁道包括多个扇区。 同步标记检测器检测扇区中的同步标记图案，其中当检测到同步标记图案时，产生同步标记检测信号和极性信号。 极性信号表示表示存储在扇区中的数据的读取信号中的脉冲的预期极性，其中极性信号增强了从读取信号中的估计数据序列的检测。
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3.发明授权Disk drive employing a sync mark detector comprising a matched filter and a dual polarity correlator 有权采用包括匹配滤波器和双极性相关器的同步标记检测器的磁盘驱动器公开(公告)号：US06603622B1
公开(公告)日：2003-08-05
申请号：US09796838
申请日：2001-02-28
IPC分类号： G11B509
CPC分类号： G11B27/3027 , G11B5/09 , G11B5/59683 , G11B2005/0016 , G11B2220/20
摘要： The present invention may be regarded as a disk drive comprising a disk having a plurality of data tracks, each data track comprising a plurality of sectors. A sync mark detector detects a sync mark pattern in a sector by filtering a read signal with a matched filter having an impulse response substantially matched to a dibit response of the disk drive. The output of the matched filter is correlated with a dual polarity correlator to generate first and second correlated signals. The sync mark pattern is detected when either the first or second correlated signals exceeds a threshold.
摘要翻译： 本发明可以被认为是包括具有多个数据磁道的磁盘的磁盘驱动器，每个数据磁道包括多个扇区。 同步标记检测器通过用具有与盘驱动器的双向响应基本匹配的脉冲响应的匹配滤波器对读取信号进行滤波来检测扇区中的同步标记模式。 匹配滤波器的输出与双极性相关器相关，以产生第一和第二相关信号。 当第一或第二相关信号超过阈值时，检测同步标记图案。
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