Patent ID: 6907187

Claim:
An information recording/reproducing medium configured to have a directory recording area, comprising: an area of a movie video recording object file for storing a movie video object including video data or audio data; an area of a still picture video recording object file for storing a still picture video object including video data or audio data; an area of an additional audio part file for storing an added audio object which is used in combination with some of video parts recorded in the still picture video recording object file; an area of a navigation data file for storing video or audio management information; and an area of a back-up management file for storing information to back up the video or audio management information, the area of said management information including different areas for program chain information, a still picture audio/video file information table, and a movie audio/video file information table, the program chain information including cell information for designating a reproduction order of the video data or the audio data in the movie video recording object file, the still picture audio/video file information table including information for managing the video data or the audio data in the still picture video recording object file, the movie audio/video file information table, including time map information specified by the cell information, for managing the video data or the audio data in the movie video recording object file, and the back-up management file having the same contents as the main management file, the back-up file having program chain information recorded therein and having the same contents as the program chain information recorded in the main management file, wherein the program chain information recorded in the main and back-up management files is updated when the video data or the audio data is recorded in an unrecorded area or deleted from a recorded area.