Method for changing a file name of a directory in a non-rewritable record medium

A method for recording information on a record medium having a first area for recording data and a second area for recording a directory to be used to manage the data, said method comprising the steps of:

• recording data in the first area of the medium;
• recording a directory including a file name of the data in the second area of the medium;
• recording in the second area of the record medium a first change directory including a file name prior to the change of data and information for indicating that the first change directory is a directory for changing the file name;
• and
• recording in the second area of the record medium a second change directory including a new file name to be imparted to said one data and information indicating that the second change directory is a directory indicating the new file name.

A record medium comprising:

• a first area having a plurality of data recorded therein;
• and
• a second area having a plurality of directories for managing the data recorded therein;
• each of said directories having a plurality of ordinary directories one for each of the data, each ordinary directory including a file name for the corresponding data and address information, and a first change directory having file names prior to the change of data recorded therein and a second change directory having file names after the change of data recorded therein.

A method for retrieving data by an apparatus that includes means for reading data and a directory from a record medium and a memory for storing the read directory, the record medium including a plurality of data, a plurality of ordinary directories for the data including file names of corresponding data and address information, a first change directory having file names prior to a change of data recorded therein, and a second change directory having file names after a change of data recorded therein, said method comprising the steps of:

• reading the ordinary directories, the first change directory and the second change directory from the medium;
• storing the read ordinary directories in a memory;
• identifying an ordinary directory stored in the memory having the same file name as the file name recorded in the first change directory;
• substituting the file name of the identified ordinary directory with the file name recorded in the second change directory in the memory;
• and
• retrieving the data recorded on the medium by using the ordinary directories including the directory having the file name substituted, which was stored in the memory.