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公开(公告)号：US20060215309A1
公开(公告)日：2006-09-28
申请号：US11434100
申请日：2006-05-15
CPC分类号： G11B19/28 , G11B5/6029 , G11B27/34 , G11B27/36 , G11B2005/0016 , G11B2220/20
摘要： A method for determining whether a data storage device read/write head is a low-flying read/write head or a non low-flying read/write head. A disc attached to a spindle motor is accelerated to an operating rotational velocity, the head is positioned over a portion of the disc non-accessible to customer data and a data pattern of selected frequency is written. A magnetoresistive element of the is biased and the data pattern is read while the disc is decelerated to a predetermined rotational velocity threshold. Occurrence of a read signal landing signature comprising readback signal amplitude modulation prior to reaching the predetermined rotational velocity threshold identifies the head as a low-flying head. Contrawise, non-occurrence of the read signal landing signature prior to reaching the predetermined rotational velocity threshold signifies the head as a non low-flying head.
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公开(公告)号：US07046463B2
公开(公告)日：2006-05-16
申请号：US10268343
申请日：2002-10-09
CPC分类号： G11B19/28 , G11B5/6029 , G11B27/34 , G11B27/36 , G11B2005/0016 , G11B2220/20
摘要： A method for determining whether a data storage device read/write head is a low-flying read/write head or a non low-flying read/write head. A disc attached to a spindle motor is accelerated to an operating rotational velocity, the head is positioned over a portion of the disc non-accessible to customer data and a data pattern of selected frequency is written. A magnetoresistive element of the is biased and the data pattern is read while the disc is decelerated to a predetermined rotational velocity threshold. Occurrence of a read signal landing signature comprising readback signal amplitude modulation prior to reaching the predetermined rotational velocity threshold identifies the head as a low-flying head. Contrawise, non-occurrence of the read signal landing signature prior to reaching the predetermined rotational velocity threshold signifies the head as a non low-flying head.
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公开(公告)号：US07113354B2
公开(公告)日：2006-09-26
申请号：US10255363
申请日：2002-09-25
申请人： Housan Dakroub , Alfredo Gay Sam
发明人： Housan Dakroub , Alfredo Gay Sam
CPC分类号： G11B27/36 , G11B5/5521 , G11B5/6005 , G11B27/34 , G11B2005/0018 , G11B2220/20
摘要： Method and apparatus for characterizing the flight characteristics of a read/write head. A disc is accelerated to a selected rotational velocity sufficient to aerodynamically support the head. The head is positioned over a portion of the disc non-accessible to customer data and a magnetoresistive element of the read/write is biased using a suitable voltage or current. A media noise landing signature obtained as the element transduces white noise from the surface identifies the head as a low-flying head.
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公开(公告)号：US06898034B2
公开(公告)日：2005-05-24
申请号：US10112273
申请日：2002-03-27
申请人： Housan Dakroub , Mukund C. Rao , Alfredo Gay Sam
发明人： Housan Dakroub , Mukund C. Rao , Alfredo Gay Sam
CPC分类号： G11B5/6005 , G11B21/21 , G11B27/36
摘要： A method of measuring fly height of a read/write head to form a fly height profile for use in measuring fly height of the read/write head relative to a disc of a disc drive. A fixed source write signal is applied to an inductive element of the read/write head, generating a magnetic flux field with a stray magnetic flux field portion. A magnetoresistive element of the read/write head couples with the magnetic flux field producing an initial field strength signal. As the disc rotates, the read/write head flies there above decreasing the density of the stray magnetic flux field portion thereby decreasing the amplitude of the field strength signal. The decreasing amplitude of the field strength signal is calibrated to a predetermined operating fly height profile to correlate fly height of the read/write head to the decreasing amplitude of the field strength field, which forms the fly height profile.
摘要翻译： 一种测量读/写头的飞行高度以形成飞高高度分布的方法，用于测量读/写头相对于盘驱动器的盘的飞行高度。 固定的源写入信号被施加到读/写头的电感元件，产生具有杂散磁通场部分的磁通场。 读/写头的磁阻元件与磁通场耦合产生初始场强信号。 当盘旋转时，读/写头在那里飞过，降低了杂散磁通场部分的密度，从而减小了场强信号的幅度。 场强信号的减小的幅度被校准到预定的操作飞行高度分布，以将读/写头的飞行高度与形成飞行高度分布的场强场的减小的幅度相关联。
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公开(公告)号：US06671790B2
公开(公告)日：2003-12-30
申请号：US09971348
申请日：2001-10-04
申请人： Alfredo Gay Sam , John Edward Young
发明人： Alfredo Gay Sam , John Edward Young
IPC分类号： G06F1200
CPC分类号： G11B20/10481 , G11B5/012 , G11B5/59627 , G11B20/10009
摘要： A method for optimizing logical track to physical track offset compensation of a data storage device includes steps of: associating each of a plurality of logical tracks to one of a plurality of physical tracks, selecting a set of sample tracks from the plurality of physical tracks, measuring an offset value for each logical track associated with one of the sample tracks, deriving, through an extrapolation technique, an offset compensation value for use with each of the sample tracks absent an association with one of the logical tracks, linking each measured offset compensation value and each estimated offset compensation value with its associated physical track, calculating, through an interpolation technique, an offset compensation value for use with each of the physical tracks absent an association with one of the sample tracks.
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