ISO/IEC 9529-1:1989
                            
                        
                            
                                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-- Part 1: Dimensional, physical and magnetic characteristics
                            
                        
                        
                        
                        
                            
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