This invention provides a method for creating/writing defect management information
of an information recording medium and an apparatus and optical disc based on the
method. In the present invention, it depends on the type of data to be reproduced
whether or not defective sectors which are detected during reproduction operation
are replaced with non-defective sectors. If read-out errors are detected in reproducing
non-audio/video data, linear replacement algorithm is applied to the corresponding
defective sectors. On the other hand, in case of audio/video data, location information
of the corresponding defective sectors is just kept without any sector replacement.
Therefore, this invention enables to reproduce audio/video data in real-time regardless
of the presence of defective sectors and to avoid writing data to the defective
sectors when new data is overwritten to the information recording medium.
