公开(公告)号：US20090122437A1

公开(公告)日：2009-05-14

申请号：US11983474

申请日：2007-11-09

申请人： Heng Gong ,  Mike X. Wang ,  Jing Zhang

发明人： Heng Gong ,  Mike X. Wang ,  Jing Zhang

IPC分类号： G11B21/21 ,  G11B5/00 ,  G11B5/60

CPC分类号： G11B5/4555 ,  G11B5/455 ,  G11B5/6029 ,  G11B5/6064 ,  G11B5/607

摘要： A method for calibrating a fly height adjustment device comprises flying a magnetic transducer coupled with a head gimbal assembly at a fly height from a magnetic recording data track. The magnetic transducer is coupled with a fly height adjustment device. Read-back signal amplitude is read from the magnetic recording data track with the magnetic transducer. The fly height is decreased with the fly height adjustment device. A linear fly height prediction is generated from the read-back signal amplitude and from power delivered to the fly height adjustment device as the fly height is decreased. The power delivered to the fly height adjustment device is compared with a difference between the linear fly height prediction and an implied fly height from the read-back signal amplitude, thereby calibrating the fly height adjustment device.

公开(公告)号：US07616398B2

公开(公告)日：2009-11-10

申请号：US11983474

申请日：2007-11-09

申请人： Heng Gong ,  Mike X. Wang ,  Jing Zhang

发明人： Heng Gong ,  Mike X. Wang ,  Jing Zhang

IPC分类号： G11B5/60

CPC分类号： G11B5/4555 ,  G11B5/455 ,  G11B5/6029 ,  G11B5/6064 ,  G11B5/607

摘要： A method for calibrating a fly height adjustment device comprises flying a magnetic transducer coupled with a head gimbal assembly at a fly height from a magnetic recording data track. The magnetic transducer is coupled with a fly height adjustment device. Read-back signal amplitude is read from the magnetic recording data track with the magnetic transducer. The fly height is decreased with the fly height adjustment device. A linear fly height prediction is generated from the read-back signal amplitude and from power delivered to the fly height adjustment device as the fly height is decreased. The power delivered to the fly height adjustment device is compared with a difference between the linear fly height prediction and an implied fly height from the read-back signal amplitude, thereby calibrating the fly height adjustment device.

摘要翻译： 用于校准飞行高度调节装置的方法包括使飞行高度与磁记录数据轨道的头万向架组件相耦合的磁换能器飞行。 磁传感器与飞行高度调节装置连接。 使用磁换能器从磁记录数据轨道读取回读信号幅度。 飞行高度随着飞行高度调节装置而减小。 当飞行高度降低时，从回读信号幅度和输送到飞行高度调节装置的功率产生线性飞行高度预测。 将传送到飞行高度调节装置的功率与回扫信号幅度之间的线性飞行高度预测和隐含飞行高度之间的差进行比较，从而校准飞行高度调节装置。

公开(公告)号：US20100027148A1

公开(公告)日：2010-02-04

申请号：US12183632

申请日：2008-07-31

申请人： Youping Deng ,  Mike X. Wang ,  Jing Zhang

发明人： Youping Deng ,  Mike X. Wang ,  Jing Zhang

IPC分类号： G11B27/36

CPC分类号： G11B5/09 ,  G11B5/455

摘要： A triple track test for determining respective erase band widths associated with a read/write head involves writing first and second data tracks in each direction and at a certain distance from an origin, and erasing a track having a center at the origin. Based on a triple track test profile (3T) corresponding to the three tracks, a first distance is measured in one direction from the origin to one of the modified data tracks and a first erase band width is computed based thereon. The other side erase band width is computable similarly. A side erase amplitude loss measurement procedure, for determining the amount of signal amplitude lost by an adjacent track due to the respective erase bands, involves constructing a side-erase profile based on a composite of the 3T profile and a full-track profile, from which respective amplitude losses are computed for the respective erase bands.

摘要翻译： 用于确定与读/写头相关联的相应擦除带宽的三重轨迹测试包括在与原点相距一定距离处的每个方向上写入第一和第二数据轨道，以及擦除在原点处具有中心的轨迹。 基于对应于三个轨道的三轨测试轮廓（3T），在从原点到修改数据轨道之一的一个方向上测量第一距离，并且基于此计算第一擦除带宽。 另一侧的擦除带宽可以类似地计算。 用于确定由于各个擦除带引起的相邻轨道损失的信号振幅的量的侧擦除幅度损耗测量程序涉及基于3T轮廓和全轨道轮廓的复合来构造侧擦除轮廓， 为相应的擦除带计算相应的振幅损失。

公开(公告)号：US20080094743A1

公开(公告)日：2008-04-24

申请号：US11708941

申请日：2007-02-20

申请人： Yong Shen ,  Mike X. Wang ,  Jing Zhang

发明人： Yong Shen ,  Mike X. Wang ,  Jing Zhang

IPC分类号： G11B5/02

CPC分类号： G11B5/455 ,  G11B5/4555

摘要： One embodiment in accordance with the invention is a method for measuring a track width for a magnetic recording head comprising writing a first track and a second track on a disk at two different positions. Note that the first track is written at a frequency plus a frequency shift value while the second track is written at the frequency minus the frequency shift value.

摘要翻译： 根据本发明的一个实施例是一种用于测量磁记录头的轨道宽度的方法，包括在两个不同位置在盘上写入第一轨道和第二轨道。 注意，第一磁道以频率加上频移值写入，而第二磁道被写入频率减去频移值。

公开(公告)号：US07907361B2

公开(公告)日：2011-03-15

申请号：US12183632

申请日：2008-07-31

申请人： Youping Deng ,  Mike X. Wang ,  Jing Zhang

发明人： Youping Deng ,  Mike X. Wang ,  Jing Zhang

IPC分类号： G11B27/36

CPC分类号： G11B5/09 ,  G11B5/455

摘要： A triple track test for determining respective erase band widths associated with a read/write head involves writing first and second data tracks in each direction and at a certain distance from an origin, and erasing a track having a center at the origin. Based on a triple track test profile (3T) corresponding to the three tracks, a first distance is measured in one direction from the origin to one of the modified data tracks and a first erase band width is computed based thereon. The other side erase band width is computable similarly. A side erase amplitude loss measurement procedure, for determining the amount of signal amplitude lost by an adjacent track due to the respective erase bands, involves constructing a side-erase profile based on a composite of the 3T profile and a full-track profile, from which respective amplitude losses are computed for the respective erase bands.

摘要翻译： 用于确定与读/写头相关联的相应擦除带宽的三重轨迹测试包括在与原点相距一定距离处的每个方向上写入第一和第二数据轨道，以及擦除在原点处具有中心的轨迹。 基于对应于三个轨道的三轨测试轮廓（3T），在从原点到修改数据轨道之一的一个方向上测量第一距离，并且基于此计算第一擦除带宽。 另一侧的擦除带宽可以类似地计算。 用于确定由于各个擦除带引起的相邻轨道损失的信号振幅的量的侧擦除幅度损耗测量程序涉及基于3T轮廓和全轨道轮廓的复合来构造侧擦除轮廓， 为相应的擦除带计算相应的振幅损失。

公开(公告)号：US20080037152A1

公开(公告)日：2008-02-14

申请号：US11463307

申请日：2006-08-08

申请人： Mike X. Wang ,  Jing Zhang

发明人： Mike X. Wang ,  Jing Zhang

IPC分类号： G11B27/36

CPC分类号： G11B19/048 ,  G11B5/455 ,  G11B5/4555

摘要： A method for operating a tester for testing heads and disks of a magnetic recording disk drive during manufacturing calculates the readback signal amplitude asymmetry in the frequency domain without the need for measurement in the time domain with a peak detection channel. The tester first signals the write head to write a first pattern on the disk to generate a readback signal with positive pulses. The read head then detects this first recorded pattern and sends the readback signal to a spectrum analyzer connected to the tester. The tester then signals the write head to write a second pattern on the disk to generate a readback signal with negative pulses. The read head then detects this second recorded pattern and sends the readback signal to the spectrum analyzer. The spectrum analyzer measures the amplitudes of the first and second readback signals in the frequency domain using a bandpass filter. A controller in the tester calculates readback signal amplitude asymmetry from the measured amplitudes of the first and second readback signals.

摘要翻译： 用于在制造期间操作用于测试磁记录盘驱动器的磁头和磁盘的测试器的方法在频域中计算回读信号幅度不对称性，而不需要使用峰值检测通道在时域中进行测量。 测试仪首先发信号通知写入头，将第一个模式写在磁盘上，以产生具有正脉冲的回读信号。 读头然后检测该第一记录图案，并将回读信号发送到连接到测试仪的频谱分析仪。 然后，测试仪发信号通知写入头，将第二个模式写入磁盘，以产生具有负脉冲的回读信号。 然后，读取头检测该第二记录图案，并将回读信号发送到频谱分析仪。 频谱分析仪使用带通滤波器测量频域中的第一和第二回读信号的振幅。 测试仪中的控制器根据第一和第二回读信号的测量幅度计算回读信号幅度不对称。

公开(公告)号：US07529050B2

公开(公告)日：2009-05-05

申请号：US11708941

申请日：2007-02-20

申请人： Yong Shen ,  Mike X. Wang ,  Jing Zhang

发明人： Yong Shen ,  Mike X. Wang ,  Jing Zhang

IPC分类号： G11B5/455 ,  G11B27/36

CPC分类号： G11B5/455 ,  G11B5/4555

摘要： One embodiment in accordance with the invention is a method for measuring a track width for a magnetic recording head comprising writing a first track and a second track on a disk at two different positions. Note that the first track is written at a frequency plus a frequency shift value while the second track is written at the frequency minus the frequency shift value.

摘要翻译： 根据本发明的一个实施例是一种用于测量磁记录头的轨道宽度的方法，包括在两个不同位置在盘上写入第一轨道和第二轨道。 注意，第一磁道以频率加上频移值写入，而第二磁道被写入频率减去频移值。

公开(公告)号：US07411754B2

公开(公告)日：2008-08-12

申请号：US11463307

申请日：2006-08-08

申请人： Mike X. Wang ,  Jing Zhang

发明人： Mike X. Wang ,  Jing Zhang

IPC分类号： G11B5/09

CPC分类号： G11B19/048 ,  G11B5/455 ,  G11B5/4555

摘要： A method for operating a tester for testing heads and disks of a magnetic recording disk drive during manufacturing calculates the readback signal amplitude asymmetry in the frequency domain without the need for measurement in the time domain with a peak detection channel. The tester first signals the write head to write a first pattern on the disk to generate a readback signal with positive pulses. The read head then detects this first recorded pattern and sends the readback signal to a spectrum analyzer connected to the tester. The tester then signals the write head to write a second pattern on the disk to generate a readback signal with negative pulses. The read head then detects this second recorded pattern and sends the readback signal to the spectrum analyzer. The spectrum analyzer measures the amplitudes of the first and second readback signals in the frequency domain using a bandpass filter. A controller in the tester calculates readback signal amplitude asymmetry from the measured amplitudes of the first and second readback signals.

摘要翻译： 用于在制造期间操作用于测试磁记录盘驱动器的磁头和磁盘的测试器的方法计算频域中的回读信号幅度不对称性，而不需要使用峰值检测通道在时域中进行测量。 测试仪首先发信号通知写入头，将第一个模式写在磁盘上，以产生具有正脉冲的回读信号。 读头然后检测该第一记录图案，并将回读信号发送到连接到测试仪的频谱分析仪。 然后，测试仪发信号通知写入头，将第二个模式写入磁盘，以产生具有负脉冲的回读信号。 然后，读取头检测该第二记录图案，并将回读信号发送到频谱分析仪。 频谱分析仪使用带通滤波器测量频域中的第一和第二回读信号的振幅。 测试仪中的控制器根据第一和第二回读信号的测量幅度计算回读信号幅度不对称。