METHOD OF RECORDING DATA ONTO AN OPTICAL CARD AND METHOD OF REPRODUCING THEM THEREFROM

摘要

Data are reproduced by reciprocally driving an optical card in a direction parallel with tracks. A guide portion without data pit is formed on both sides of each of the tracks to prevent read errors from occurring during the acceleration and deceleration of reciprocal movement. Track identification data and end-of-track data are recorded adjacent to the guide portion, and user data are recorded in between. The user data are divided into groups which are recorded on the optical card in a dispersed manner. On the optical card are provided a directory pointer region, a directory region and a data region. When the directory is changed accompanying a change in the data region, a new directory and directory pointer, indicating the position of the latest directory, are written into their appropriate region.