公开(公告)号：US07369340B1

公开(公告)日：2008-05-06

申请号：US11314483

申请日：2005-12-21

申请人： Dean V. Dang ,  Philip Bernard Saram ,  Chakrit Choosang ,  Jonas A. Goode

发明人： Dean V. Dang ,  Philip Bernard Saram ,  Chakrit Choosang ,  Jonas A. Goode

IPC分类号： G11B27/36 ,  G11B5/09

CPC分类号： G11B5/59688

摘要： A disk drive is disclosed comprising a disk having top and bottom surfaces, and top and bottom heads actuated over the top and bottom surfaces, respectively. Control circuitry detects a warping of the disk by writing a first test pattern to the top surface, reading the first test pattern to generate a first read signal, monitoring a first read signal value proportional to an amplitude of the first read signal, writing a second test pattern to the bottom surface, reading the second test pattern to generate a second read signal, monitoring a second read signal value proportional to an amplitude of the second read signal, and processing the first and second read signal values to detect a negative correlation between the amplitudes of the first and second read signals.

摘要翻译： 公开了一种磁盘驱动器，其包括具有顶表面和底表面的盘，并且顶顶和底头分别在顶表面和底表面上被致动。 控制电路通过向第一表面写入第一测试图案来检测盘的翘曲，读取第一测试图案以产生第一读取信号，监测与第一读取信号的幅度成比例的第一读取信号值，写入第二读取信号 测试图案到底面，读取第二测试图案以产生第二读取信号，监测与第二读取信号的幅度成比例的第二读取信号值，以及处理第一和第二读取信号值以检测第一和第二读取信号之间的负相关性 第一和第二读信号的振幅。

公开(公告)号：US07804657B1

公开(公告)日：2010-09-28

申请号：US11761224

申请日：2007-06-11

申请人： Dennis W. Hogg ,  Jonas A. Goode ,  Tuyen V. Trinh

发明人： Dennis W. Hogg ,  Jonas A. Goode ,  Tuyen V. Trinh

IPC分类号： G11B5/03

CPC分类号： G11B5/3903 ,  G11B2005/0016

摘要： A method is disclosed for setting an operating bias current for a magnetoresistive (MR) element. A bias current is applied to the MR element, and a voltage across the MR element is measured corresponding to the bias current. The bias current is then adjusted in response to the bias current multiplied by a ratio of a target voltage and the measured voltage. The adjusted bias current is then applied to the MR element. In one embodiment, the bias current is adjusted until the measured voltage substantially equals the target voltage.

摘要翻译： 公开了一种用于设置磁阻（MR）元件的工作偏置电流的方法。 对MR元件施加偏置电流，并且对应于偏置电流测量MR元件两端的电压。 然后响应于偏置电流乘以目标电压和测量电压的比率来调整偏置电流。 然后将调整后的偏置电流施加到MR元件。 在一个实施例中，调整偏置电流直到测得的电压基本上等于目标电压。

公开(公告)号：US07872824B1

公开(公告)日：2011-01-18

申请号：US11761266

申请日：2007-06-11

申请人： Curtis V. Macchioni ,  Jonas A. Goode ,  Matthew R. Gibbons ,  Tao Pan ,  Andrei F. Khapikov

发明人： Curtis V. Macchioni ,  Jonas A. Goode ,  Matthew R. Gibbons ,  Tao Pan ,  Andrei F. Khapikov

IPC分类号： G11B5/03

CPC分类号： G11B5/02 ,  G11B5/6005 ,  G11B5/6064 ,  G11B2005/0018

摘要： A disk drive is disclosed having a disk, and a head actuated over the disk, the head comprising a magnetoresistive (MR) element. Control circuitry within the disk drive sets an operating bias current for the MR element by computing a target voltage for the MR element, applying a bias current to the MR element, measuring a voltage across the MR element corresponding to the bias current, and adjusting the bias current applied to the MR element until the measured voltage substantially equals the target voltage.

摘要翻译： 公开了一种盘驱动器，其具有盘，并且在盘上致动的头，头包括磁阻（MR）元件。 磁盘驱动器内的控制电路通过计算MR元件的目标电压为MR元件设置工作偏置电流，向MR元件施加偏置电流，测量对应于偏置电流的MR元件两端的电压，并调整 施加到MR元件的偏置电流，直到测量的电压基本上等于目标电压。