Information processing
ISO/IEC 9529 ("Information processing systems — Data interchange on 90 mm (3,5 in) flexible disk cartridges using modified frequency modulation recording at 15 916 ftprad, on 80 tracks on each side") is a standard published by the International Organization for Standardization which defines the data format used on 3.5 inch floppy disks. It is also known as ECMA-125.