This International Standard specifies the characteristics of 90 mm flexible disk cartridges of 10MB formatted capacity, recorded at 33 157 ftprad using modified frequency modulation recording and sector servo tracking on 255 data tracks on each side. Such Flexible Disk Cartridges are identified as ISO Type 304. It specifies the mechanical, physical and magnetic characteristics of the cartridge, so as to provide physical interchangeability between data processing systems.