公开(公告)号：US20100097714A1

公开(公告)日：2010-04-22

申请号：US12255776

申请日：2008-10-22

申请人： Walter Richard Eppler ,  Inci Ozgunes ,  Xiangjun Feng ,  Kevin Arthur Gomez ,  Mark David Bedillion ,  Stephen John Wrazien

发明人： Walter Richard Eppler ,  Inci Ozgunes ,  Xiangjun Feng ,  Kevin Arthur Gomez ,  Mark David Bedillion ,  Stephen John Wrazien

IPC分类号： G11B20/10

CPC分类号： G11B20/10009 ,  G11B5/59605 ,  G11B20/10046 ,  G11B20/10425 ,  G11B2020/1281 ,  G11B2220/2516

摘要： A data storage system includes a storage medium having a plurality of data sectors and a head that communicates with the data storage medium. The head produces a readback signal when reading information from the data storage medium. A computation unit extracts a distortion component of the readback signal and generates a position error signal from the distortion component.

摘要翻译： 数据存储系统包括具有多个数据扇区的存储介质和与数据存储介质进行通信的磁头。 当从数据存储介质读取信息时，磁头产生回读信号。 计算单元提取回读信号的失真分量，并从失真分量生成位置误差信号。

公开(公告)号：US07885025B2

公开(公告)日：2011-02-08

申请号：US12255776

申请日：2008-10-22

申请人： Walter Richard Eppler ,  Inci Ozgunes ,  Xiangjun Feng ,  Kevin Arthur Gomez ,  Mark David Bedillion ,  Stephen John Wrazien

发明人： Walter Richard Eppler ,  Inci Ozgunes ,  Xiangjun Feng ,  Kevin Arthur Gomez ,  Mark David Bedillion ,  Stephen John Wrazien

IPC分类号： G11B20/10

CPC分类号： G11B20/10009 ,  G11B5/59605 ,  G11B20/10046 ,  G11B20/10425 ,  G11B2020/1281 ,  G11B2220/2516

摘要： A data storage system includes a storage medium having a plurality of data sectors and a head that communicates with the data storage medium. The head produces a readback signal when reading information from the data storage medium. A computation unit extracts a distortion component of the readback signal and generates a position error signal from the distortion component.

摘要翻译： 数据存储系统包括具有多个数据扇区的存储介质和与数据存储介质进行通信的磁头。 当从数据存储介质读取信息时，磁头产生回读信号。 计算单元提取回读信号的失真分量，并从失真分量生成位置误差信号。

公开(公告)号：US06788481B2

公开(公告)日：2004-09-07

申请号：US10104422

申请日：2002-03-21

申请人： Peter Chen-I Fang ,  Xiangjun Feng ,  Terence Tin-Lok Lam ,  Zhong-Heng Lin

发明人： Peter Chen-I Fang ,  Xiangjun Feng ,  Terence Tin-Lok Lam ,  Zhong-Heng Lin

IPC分类号： G11B2736

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/09 ,  G11B20/10009 ,  G11B27/36 ,  G11B2005/001 ,  G11B2005/3996 ,  Y10S977/934

摘要： A nonlinear transition shift (NLTS) measurement procedure for read/write heads employing a giant magnetoresistive (GMR) merged heads. The method of this invention includes the pulse-shape distortion effects on recording nonlinearity, which can significantly affect the existing theoretical formulae for calculating nonlinearity correction factor from measured partial erasure values, and second-order approximation of equation of NLTS and nonlinearity correction factor. Transition broadening effects (TBE) and partial erasure (PE) are incorporated in the NLTS measurement procedure to permit accurate isolation of the NLTS from the unrelated TBE/PE and GMR nonlinear transfer characteristic (NTC). First, a fifth harmonic elimination (5HE) test is performed at bit period T to measure a first nonlinearity value X. Then two partial erasure (PE) tests are done at two different densities, one below the PE threshold to measure a second nonlinearity value XS and the other at the same density as the 5HE test to measure a third nonlinearity value Xh. Finally, the NLTS is computed by combining the first, second and third nonlinearity values.

摘要翻译： 采用巨磁阻（GMR）合并磁头的读/写头的非线性转换偏移（NLTS）测量程序。 本发明的方法包括对记录非线性的脉冲形状失真影响，这可以显着影响现有的用于从测量的部分擦除值计算非线性校正因子的理论公式，以及NLTS和非线性校正因子等式的二阶近似。 过渡拓宽效应（TBE）和部分擦除（PE）被纳入到NLTS测量程序中，以允许NLTS与无关TBE / PE和GMR非线性传递特性（NTC）的精确隔离。 首先，在位周期T执行第五次谐波消除（5HE）测试以测量第一非线性值X.然后，以两个不同的密度进行两次部分擦除（PE）测试，一个低于PE阈值，以测量第二非线性值 XS和另一个与5HE测试相同的密度来测量第三非线性值Xh。 最后，通过组合第一，第二和第三非线性值来计算NLTS。