ANSI INCITS 126

Abstract

This standard specifies the general, physical, and magnetic requirements for interchangeability of the one- or two-sided, 5.25-inch (130.mm) (nominal), 96-tracks-per-inch (tpi) (3,8-tracks-per-millimeter (tpmm)) 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. The two-sided flexible disk cartridge enclosed in a protective envelope and having two recording surfaces is of the type intended specifically for use with digital recording and reproducing equipment employing access mechanisms capable of positioning to these data tracks. There are three possible variations in the quantity of additional sector holes described in this standard. Version A utilizes no sector holes, only a single index hole; Version B utilizes 10 sector holes in addition to the index hole; and Version C utilizes 16 sector holes in addition to the index hole. These configurations are further described in 5 .1.3.3 and Figure 2. The existence and number of sector holes shall be specified by the user. Purpose. This standard defines the requirements and supporting test methods necessary to ensure interchange at acceptable performance levels. It is distinct from a specification in that it delineates a minimum of restrictions consistent with compatibility in interchange transactions.