公开(公告)号：US20020023248A1

公开(公告)日：2002-02-21

申请号：US09764385

申请日：2001-01-19

申请人： FUJITSU LIMITED

发明人： Tomohiro Suzuki ,  Kaneyasu Shimoda

IPC分类号： G11C029/00

CPC分类号： G11B20/182 ,  G11B20/10046 ,  G11B20/10296

摘要： In a medium defect detection method of the invention, a data storage apparatus selectively operable for one of a normal data reading and a medium defect detection is provided, the data storage apparatus providing an ability to correct an error in readout information during the normal data reading. A sequence of data frames is written to a storage medium. The data frame sequence is read from the medium by producing a readout signal. It is determined whether an error occurs in the readout signal. The writing, reading and determining steps are performed during the medium defect detection by inhibiting the error correction ability of the data storage apparatus. In a data storage apparatus of the invention, a read/write unit writes a sequence of data frames to the medium and reads the sequence of data frames from the medium by producing a readout signal. A detector, selectively operable for one of a normal data reading and a medium defect detection, the detector performing a maximum likelihood sequence detection of the readout signal, providing an ability to correct an error in the readout signal. The detector performs an error detection of the readout signal. A control unit controls the detector to perform selected one of the sequence detection and the error detection, wherein, when the error detection is selected, the control unit reduces the error correction ability of the sequence detection.

摘要翻译： 在本发明的中等缺陷检测方法中，提供了可选择性地操作用于正常数据读取和中间缺陷检测之一的数据存储装置，该数据存储装置提供在正常数据读取期间校正读出信息中的错误的能力 。 将一系列数据帧写入存储介质。 通过产生读出信号从介质读取数据帧序列。 确定读出信号中是否发生错误。 通过抑制数据存储装置的纠错能力，在介质缺陷检测期间执行写入，读取和确定步骤。 在本发明的数据存储装置中，读/写单元将一系列数据帧写入介质，并通过产生读出信号从介质读取数据帧序列。 检测器，可选地可操作用于正常数据读取和中等缺陷检测之一，检测器执行读出信号的最大似然序列检测，提供校正读出信号中的误差的能力。 检测器执行读出信号的错误检测。 控制单元控制检测器执行选择的序列检测和错误检测之一，其中当选择错误检测时，控制单元降低序列检测的纠错能力。