公开(公告)号：US20110249358A1

公开(公告)日：2011-10-13

申请号：US13085657

申请日：2011-04-13

Applicant: Ji-young LEE ,  Man-sik Sim

Inventor： Ji-young LEE ,  Man-sik Sim

IPC: G11B5/02

CPC classification number: G11B20/1816 ,  G11B2220/2516

Abstract: A method and apparatus to detect a defective sector include features of determining a first error value by counting the number of error symbols in first data read from a sector by using a head in an on-track state, and reading second data from the sector by off-tracking the head in a positive direction and third data from the sector by off-tracking the head in a negative direction in response to the first error value being equal to or greater than a first threshold value. Additionally, a second error value is determined based on the number of error symbols in the read second data and a third error value is determined based on the number of error symbols in the read third data. Accordingly, the sector is determined to have a defect by comparing an average of the second and third error values to a second threshold value.

Abstract translation: 用于检测缺陷扇区的方法和装置包括通过使用在轨道状态下的头从扇区读取的第一数据中的误差符号的数量进行计数来确定第一误差值的特征，以及从扇区读取第二数据， 响应于第一误差值等于或大于第一阈值，通过以负方向偏移磁头来从正向切向磁头和来自扇区的第三数据。 此外，基于读取的第二数据中的错误符号的数量确定第二错误值，并且基于读取的第三数据中的错误符号的数量来确定第三错误值。 因此，通过将第二和第三误差值的平均值与第二阈值进行比较来确定扇区具有缺陷。