Specifies the characteristics of 130-mm optical disk cartridges (ODC) of the type providing for information to be written, read, and erased many times using the magneto-optical effect. Specifies definitions of the essential concepts, the environment in which the characteristics shall be tested, the environments in which the cartridge shall be operated and stored, the mechanical, physical, and dimensional characteristics of the case and of the optical disk, the magneto-optical characteristics and the recording characteristics for recording the information and for erasing it many times, so as to provide physical interchangeability between data processing systems.