Patent ID: 7487175
Filing Date: 2009-02-03
Classification: G11B,Y10S

Abstract:
1. A file management method for managing a plurality of files stored in a predetermined region, comprising the steps of: classifying extract information of the files and a folder for individual types of the extract information into groups including a group of property to which property information of the files is allocated and a different group different from the group of property; allocating, in the different group of the extract information, the extract information of one of the files or the folder to one or a plurality of slots of a fixed length; and allocating, in the group of property, the extract information of the one file or the folder to one or a plurality of slots of the fixed length so that said group of property has slots at least corresponding to the slots of the different group to produce an index file; the slots of the group of property having set therein management information for managing the groups being set; the management information of each of the slots of the group of property having set therein valid/invalid information representative of whether the slot is valid or invalid, an extension slot number pointing to an extension slot succeeding the slot, presence/absence information representative of whether a corresponding slot of the different group to which the extract information of the file relating to the slot is allocated is present or absent, a slot number pointing to the corresponding slot of the different group, and extension information representative of whether or not the corresponding slot of the different group is an extension slot; a combination of the slots to which the extract information of the one file or the folder is allocated with the extension slot number, presence/absence information, slot number, and extension information being indicated by the group of property.