公开(公告)号：US07369340B1

公开(公告)日：2008-05-06

申请号：US11314483

申请日：2005-12-21

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

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

IPC: G11B27/36 ,  G11B5/09

CPC classification number: G11B5/59688

Abstract: 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.

Abstract translation: 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。