Information recording/reproducing apparatus with means for substituting predetermined good sectors for defective ones

摘要

An information recording and reproducing apparatus for recording information on the recording medium and reproducing the information from the recording medium has a data recording region of a sector structure in which the region is divided into a plurality of sectors. There are provided means for designating alternate sector to be used in place of a defective sector and means for adding to data a logical address of a sector where the data is to be recorded. Reproduction from the sector where the desired data is recorded can be accomplished by using only a physical address without being influenced by difference between the physical address and the logical address brought about by the occurrence of the defective sector.