Patent ID: 7050701

Claim:
A data storage medium readable by a computer for recording and reproducing files managed using a volume/file structure, the number of data recording operations to any same area of the data storage medium being limited, said data storage medium comprising: as a part of the volume/file structure, a partition descriptor containing address information for an unallocated space information control block (ICB) for managing unallocated space in a volume space, and a logical volume descriptor containing address information for a root directory ICB for managing a directory structure under the root directory, said unallocated space ICB containing address information for a following unallocated space ICB and address information for unallocated space; said root directory ICB containing address information for a following root directory ICB and address information for a root directory file; and said unallocated space ICB and root directory ICB being recorded to a chaining information area as chaining information that is part of a progressively updated and recorded file structure in order to manage a file of the data storage medium read by the computer.