This International Standard specifies the characteristics of 90 mm Optical Disk Cartridges (ODC) with a capacity of 230 Mbytes per Cartridge. The Standard specifies three related, but different implementations of such cartridges, viz, Type R/W, Type P-ROM, Type O-ROM. Type R/W, Type P-ROM and Type O-ROM are also referred to as "fully re-writable", "partially embossed" and "fully embossed", respectively. This International Standard provides for interchange between optical disk drives. Together with a standard for volume and file structure, it provides for full data interchange between data processing systems.