Patent ID: 6658439
Filing Date: 2003-12-02
Classification: G06F,G11B,Y10S

Abstract:
A file system for reading an object file from a recording medium in which one or more files are recorded each in the form of a data sequence, comprising:an accessing section for taking access to the recording medium to read out said object file in terms of unit record areas in the recording medium; a file allocation table for managing address information about said unit record areas in which said object file is recorded; a unit record area retrieving section for retrieving particular one or more set of said unit record areas to which said object file is allocated, by referring said file allocation table; one or more jump tables, provided one for each file, in which each jump table (i) location information about individual data locations from the start of said each file and (ii) unit-record-area numbers corresponding to the individual data locations are registered in terms of predetermined distances from the start of said each file in said file allocation table; and a jump table retrieving section for retrieving a particular unit-recording-area number from one of said jump tables which corresponds to said object file; when said object file is read from the recording medium, said jump table retrieving section retrieves a unit-record-area number corresponding to the unit record area to which desired individual data of said object file is allocated or a unit-record-area number near desired individual data of said object file, said unit record area retrieving section retrieves a unit record area containing said desired data by referring said file allocation table based on said unit-record-area number retrieved by said jump table retrieving section, and said accessing section reads out said desired individual data recorded in said unit record area retrieved by said unit record area retrieving section.