ISO 7929:1985, Information processing - Magnetic disk for data storage devices - 83 000 flux transitions per track, 130 mm (5.12 in) outer diameter, 40 mm (1.57 in) inner diameter

Specifies mechanical, physical and magnetic characteristics of a lubricated disk of 130 mm (5,12 in) outer diameter and 40 mm (1,57 in) inner diameter to be mounted on data storage devices. Defines requirements for proper performance at 83 332 flux transition per track.