Optical disk

摘要

In an optical disk, data are recorded by using a hierarchical file structure in which a frame (Fn) is composed of digitized data, a packet (Pm) is composed of at least one frame, and a pack is composed of at least one packet. In this structure, the pack is composed of an integral number of packets (Pm), each packet being completed, and each of the packets is composed of an integral number of frames (Fn), each frame being completed. Therefore, there is no possibility that one frame is assigned over two or more different packets and one packet is assigned over two or more different packs. Since an integral number of frames are assigned in each packet, when a packet header (11) is detected, reproduction of data can be carried out from the beginning of each packet. <IMAGE>