This standard specifies the general@ physical@ and magnetic requirements for interchangeability of the singlesided flexible disk cartridge - for use at 6631 bits per radian (BPR) - as required to achieve unformatted disk cartridge interchange among disk drives and associated information processing systems. The single-sided flexible disk cartridge (for 663 I-BPR use)@ enclosed in a protective envelope and having at least one recording surface@ is of the type intended specifically for use with digital recording and reproducing equipment employing access mechanisms capable of positioning to 77 data tracks. This standard is not intended as a substitute for a purchase specification.