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

摘要

PROBLEM TO BE SOLVED: To improve the reliability of data recording by arranging a 2nd spare area in an area whose physical sector number is larger than that of a spare sector of a 1st spare area and making the 2nd spare area expandable in a direction where physical sector numbers get smaller outside a volume space. 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 file entry area 116. When a defective area is replaced by an alternate area of a 2nd space area, the defective area is replaced in descending order of a physical sector number, and a defect management information area has an area where information showing the position of the defective area, information showing the position of an alternate area in the 2nd spare area and the position of the 2nd spare area are recorded.