Information Processing - Data Interchange on 130 mm (5.25 in) Flexible Disk Cartridges Using Modified Frequency Modulation Recording at 7 958 ftprad, 3.8 tpmm (96 tpi), on Both Sides - Part 1: Dimensional, Physical and Magnetic Characteristics
This part of ISO 8378 specifies the dimensional, physical and magnetic characteristics of the cartridge so as to provide physical interchangeability between data processing systems.
NOTE - Numeric values in the SI and/or Imperial measurement system in this part of ISO 8378 may have been rounded off and therefore are consistent with, but not exactly equal to, each other. Either system may be used, but the two should be neither intermixed nor re-converted. The original design was made using Imperial units and further developments were made using SI units.
Inspection of measuring and test equipment - Instructions for the inspection of measuring and test equipment for geometrical quantities - Uncertainty of measurement
