Method and apparatus for management of information where sub directory information in a directory identifies the relative recording location of the sub directory

摘要

PCT No. PCT/JP94/01750 Sec. 371 Date Jul. 31, 1995 Sec. 102(e) Date Jul. 31, 1995 PCT Filed Oct. 18, 1994 PCT Pub. No. WO95/11508 PCT Pub. Date Apr. 27, 1995In this invention, data track of a magneto-optical disc is divided into a volume management area and an extent area to record data of file into the extent area, and to record directory management information and file management information into the volume management area. The volume management area is caused to consist of 32 clusters. Data allocation unit of the volume management area is caused to be 2 k bytes and data allocation unit in the extent area is caused to be 8 k bytes. Relative recording location within the volume management area of sub directory is recorded, as directory information, into the volume management area. Thus, this invention can quickly carry out access.