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INCITS 137-1988[S2008]
Information Systems û One- and Two-sided, Unformatted, 90-mm (3.5-in), 5.3-tpmm (135-tpi) Flexible Disk Cartridge for 7958 BPR Use û General, Physical, and Magnetic Requirements (formerly ANSI X3.137:1988/AM1-1999)
The revision contains substantive and editorial changes to ANSI X3.137:1988. The standard specifies the general, physical and magnetic requirements for inter-changeability of the one-and two-sided 90mm (3.5 in) (nominal) flexible disk cartridge (for 7958 bits-per-radian (bpr) use) as required to achieve unformatted disk cartridge interchange among disk drives using 80 tracks per side and associated information processing systems.
InterNational Committee for Information Technology Standards [incits]