MEDIUM AND METHOD FOR RECORDING INFORMATION AND INFORMATION RECORDING AND REPRODUCING SYSTEM

摘要

PROBLEM TO BE SOLVED: To guarantee the reliability of data recording by arranging a 2nd spare area provided with an alternative area including a spare sector substituting for a defective area and making a 2nd volume structure area expandable in a prescribed direction. SOLUTION: A system controller recognizes an unallocated area 107 on the basis of data reproduced from a space bitmap area 113 and decides an area to be secured as an additional spare area. Data stored in a memory for a file structure is updated and data stored in a memory for bitmap is updated in order to register the spare area to be expanded with a fine entry area 116. Further, a defect management information area has an area for recording information showing whether an alternative area including a spare sector which can be used for 1st and 2nd spare areas exists and information showing that the 2nd spare area is not arranged.