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 theInternational Organization for Standardization which defines the data format used on 3.5 inchfloppy disks. It is also known asECMA-125.

The standard consists of two parts:

• ISO/IEC 9529-1:1989:Part 1: Dimensional, physical and magnetic characteristics
• ISO/IEC 9529-2:1989:Part 2: Track format

• International Organization for Standardization
• ISO/IEC 9529-1:1989
• ISO/IEC 9529-2:1989

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