| 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.
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