Optical record medium including data record region and directory record region and method of managing file data

A method of managing file data recorded in an optical record medium comprising:

• recording file data on a track in a data record region in the optical record medium;
• preparing an ordinary directory including at least a file name specific to said file data recorded in the data region, a file size denoting a size of the relevant file data and a track address denoting the track on which the relevant file data is recorded;
• preparing a file name changing directory including at least an old file name and a new file name;
• recording said ordinary directory and file name changing directory in a directory record region in the optical record medium;
• reading all ordinary directories and file name changing directories out of the directory record region in the optical record medium;
• storing the thus read out directories in a memory;
• changing an old file name contained in an ordinary directory stored in the memory by a new file name contained in a corresponding file name changing directory in which said old file name and new file name are recorded;
• entering a file name of file data to be read out of the data record region;
• retrieving a directory having a file name corresponding to the entered file name out of the directories stored in the memory;
• reading a track address in the retrieved directory;
• and
• reading file data recorded on a track denoted by said track address contained in the retrieved directory.