公开(公告)号：US5600500A

公开(公告)日：1997-02-04

申请号：US337306

申请日：1994-11-14

申请人： Timothy A. Madsen ,  Michael J. Roe

发明人： Timothy A. Madsen ,  Michael J. Roe

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B20/18 ,  G11B27/36

CPC分类号： G11B20/10481 ,  G11B20/1816 ,  G11B20/1879 ,  G11B27/36 ,  G11B5/09 ,  G11B2005/0013 ,  G11B5/012 ,  G11B5/035

摘要： A method of optimizing write current in a data storage system. The write current is optimized by measuring a bit error rate in the storage system as a function of the write current in the presence of background interference stress and adjacent track interference stress. An optimum write current level is determined as a function of the measured bit error rate.

摘要翻译： 一种优化数据存储系统中写入电流的方法。 通过在存在背景干扰应力和相邻轨道干涉应力的情况下，通过测量存储系统中的误码率作为写入电流的函数来优化写入电流。 确定最佳写入电流电平作为测量的误码率的函数。

公开(公告)号：US5130877A

公开(公告)日：1992-07-14

申请号：US734058

申请日：1991-07-22

申请人： Wei C. Hsie ,  Timothy A. Madsen ,  Nathan Curland

发明人： Wei C. Hsie ,  Timothy A. Madsen ,  Nathan Curland

IPC分类号： G11B5/31

CPC分类号： G11B5/3116 ,  G11B5/313

摘要： A thin film magnetic read/write head deposited upon a magnetic substrate and including a shallow top pole take-off angle reduces leading and trailing undershoots in an isolated pulse signal. The undershoots are reduced by minimizing the magnetic discontinuities across the recording surface of the head, except for the recording gap.

摘要翻译： 沉积在磁性基板上并包括浅顶极起飞角的薄膜磁读/写头减少隔离脉冲信号中的前后拖尾。 除了记录间隙之外，通过最小化头部记录表面上的磁不连续性来减少下冲。

公开(公告)号：US06512367B2

公开(公告)日：2003-01-28

申请号：US09776024

申请日：2001-02-02

申请人： Hua Liu ,  Timothy A. Madsen ,  Alex C. Toy ,  Lezlie A. Hughes

发明人： Hua Liu ,  Timothy A. Madsen ,  Alex C. Toy ,  Lezlie A. Hughes

IPC分类号： G01R3312

CPC分类号： G11B5/012 ,  G11B5/455

摘要： This invention presents a method and system for testing a disc drive head usable with a disc drive head testing device. The steps for this include determining an unknown electrical property of the head testing device. This is done by generating output signals at the output stage. The testing device property is then computed by solving for the unknown electrical property based on the output signals generated for each of the known test devices. For each disc drive head under test, the head is coupled to the input lead and exposed to a stored magnetic data pattern to generate a read signal at the input lead. The measured difference affects the generated read output signal. The read output signal is adjusted based on the testing device property and the measured property to compensate for differences in the measured property.

公开(公告)号：US5469305A

公开(公告)日：1995-11-21

申请号：US169423

申请日：1993-12-17

申请人： Timothy A. Madsen ,  Russell J. Machelski

发明人： Timothy A. Madsen ,  Russell J. Machelski

IPC分类号： G11B5/035 ,  G11B5/09 ,  H03F3/45 ,  G11B5/03

CPC分类号： G11B5/09 ,  H03F3/45977 ,  G11B5/035

摘要： A DC offset voltage is added to the analog timing signal in a peak detection data recovery circuit to cancel the timing asymmetry from a magnetoresistive head signal. An AC timing asymmetry cancellation circuit uses a charge pump, buffer amplifier and resistor divider to produce the proper DC offset voltage automatically.

摘要翻译： 在峰值检测数据恢复电路中，将一个DC偏移电压加到模拟定时信号上，以从磁阻头信号中消除定时不对称。 AC定时不对称消除电路使用电荷泵，缓冲放大器和电阻分压器自动产生适当的直流失调电压。

公开(公告)号：US5381291A

公开(公告)日：1995-01-10

申请号：US202052

申请日：1994-02-25

申请人： Timothy A. Madsen ,  Daniel J. O'Connor

发明人： Timothy A. Madsen ,  Daniel J. O'Connor

IPC分类号： G01R33/09 ,  G11B5/39 ,  G11B5/127

CPC分类号： G11B5/3932 ,  G01R33/09 ,  G01R33/096 ,  G11B5/3903 ,  G11B5/398

摘要： A magnetoresistive sensor has an air bearing surface, first and second vertical contacts having contact edges generally perpendicular to the air bearing surface, a generally rectangular magnetoresistive region having a first edge that comprises part of the air bearing surface and a plurality of additional edges which do not comprise part of the air bearing surface, and a permanent magnet layer having a magnetization vector oriented at 45.degree. with respect to the air bearing surface, wherein the plurality of additional edges are generally within the permanent magnet layer. The magnetoresistive sensor provides a relatively square read sensitivity window because the sense current is maintained parallel to the air bearing surface throughout the magnetoresistive region. In addition, the sensor is lapping intolerant because the relative positions of the first and second vertical contacts and the magnetoresistive region do not change as the air bearing surface is lapped.

摘要翻译： 磁阻传感器具有空气轴承表面，第一和第二垂直触点具有大致垂直于空气支承表面的接触边缘，大致矩形的磁阻区域，其具有包含空气轴承表面的一部分的第一边缘和多个附加边缘 不包括空气轴承表面的一部分，以及具有相对于空气轴承表面定向成45度的磁化矢量的永磁体层，其中多个附加边缘通常在永磁体层内。 磁阻传感器提供相对平方的读灵敏度窗口，因为感测电流保持与整个磁阻区域中的空气轴承表面平行。 此外，由于第一和第二垂直触点和磁阻区域的相对位置随着空气轴承表面被研磨而不改变，因此传感器研磨不耐受。

公开(公告)号：US5331479A

公开(公告)日：1994-07-19

申请号：US12041

申请日：1993-02-01

申请人： Timothy A. Madsen

发明人： Timothy A. Madsen

IPC分类号： G11B5/09 ,  G11B5/02 ,  G11B5/03

CPC分类号： G11B5/022 ,  G11B5/09

摘要： A write circuit in a magnetic disc drive writes data to a magnetic disc based on a write signal received. The write circuit includes a magnetic write head, an H-switch, and a headroom assistance circuit. The headroom assistance circuit includes a voltage divider, a capacitor, and a charging circuit for charging and discharging the capacitor based on the write signals so that increased voltage appears across the magnetic recording write head during switching of the current polarity by the H-switch.

摘要翻译： 磁盘驱动器中的写入电路基于所接收的写信号将数据写入磁盘。 写入电路包括磁性写入头，H开关和余量辅助电路。 余量辅助电路包括分压器，电容器和用于基于写入信号对电容器进行充电和放电的充电电路，使得在通过H开关切换电流极性期间磁记录写入头上出现增加的电压。