Describes the quality of recorded signals, the track layout and track format for 130 mm (5,25 in) flexible disk cartridges intended for data interchange between data processing systems and recorded at 7 958 ftprad and 3,8 tpmm (96 tpi) on both sides using modified frequency modulation recording. Such a flexible disk cartridge shall be in conformance with ISO 8378 if meeting either the requirements of parts 1 and 2 or 1 and 3. References: ISO 646, 2022, 4873, 7665 and 8378/1 and 3.