公开(公告)号：US20130335843A1

公开(公告)日：2013-12-19

申请号：US13891735

申请日：2013-05-10

Applicant: Agency for Science, Technology And Research

Inventor： Budi Santoso ,  Yuan Zhimin ,  Siang Huei Leong ,  Chun Lian Ong ,  Pantelis Elexopoulos

IPC: G11B27/36

CPC classification number: G11B5/09 ,  G11B5/6029 ,  G11B19/048 ,  G11B27/36

Abstract: Methods and architecture for monitoring hard disk drive operation is provided. The hard disk drive system provided includes a spindle, a head and a disk with a disk medium including a buried servo layer having a first frequency of data on a first track and a second frequency of data on a second track, the second track adjacent to the first track. The method includes the steps of writing a wide track pattern having a predetermined frequency on a track of a hard disk drive medium, generating a readback signal by reading the pattern from the track, processing the readback signal by mixing the readback signal with a reference signal to obtain a mixed signal having a summed signal and a difference signal, and filtering the mixed signal by a filter centered around the difference signal to generate a measurement signal corresponding to a relative speed change of the spindle and a head-to-disk motion. In addition, filtering a readback signal generated by the head when positioned at the middle of the first track and the second track with a first filter centered at the first frequency and a second filter centered at the second frequency is used to generate signals for determining spindle speed variation, spindle speed jitter, and relative head-disk vibration in the downtrack direction, for synchronizing writing in Two Dimensional Magnetic Recording (TDMR) and for measuring continuous flying height information based on Wallace equations.

Abstract translation: 提供了监控硬盘驱动器操作的方法和架构。 提供的硬盘驱动器系统包括主轴，磁头和磁盘，磁盘介质包括在第一磁道上具有第一数据频率的掩埋伺服层和在第二磁道上的第二数据频率的第二磁道， 第一轨。 该方法包括以下步骤：在硬盘驱动器介质的轨道上写入具有预定频率的宽轨道图案，通过从轨道读取图案产生回读信号，通过将回读信号与参考信号混合来处理回读信号 以获得具有加和信号和差分信号的混合信号，并且通过以差分信号为中心的滤波器对混合信号进行滤波，以产生对应于主轴的相对速度变化和头对盘运动的测量信号。 此外，当位于第一轨道的中间处的头部产生的回读信号和以第一频率为中心的第一滤波器的第二轨道和以第二频率为中心的第二滤波器进行滤波生成用于确定主轴的信号 速度变化，主轴转速抖动以及沿横向方向的相对头盘振动，用于在二维磁记录（TDMR）中同步写入以及基于Wallace方程测量连续飞行高度信息。