Information management method, data recording medium, data recording method, information retrieving method and information retrieving apparatus

摘要

This invention relates to an information management method for magnetooptic disks, etc., a data recording medium, a data recording method, a method and apparatus for information retrieval, and aims at quickly making access. A data track of a magnetooptic disk is divided into a volume management area and an extent area. Data of files are recorded in the extent area, and directory management information and file management information are recorded in the volume management area. The volume management area contains 32 clusters. The data allocation unit of the volume management area is 2 Kbytes and that of the extent area is 8 Kbytes. A relative recording position inside the volume management area of a sub-directory is recorded as directory information in the volume management area.