规定了5.25英寸（130毫米）（标称）双面连接器互换性的一般、物理和磁性要求，每英寸48磁道（tpi）（每毫米1.9磁道（tpmm））柔性盒式磁盘（用于7958位/弧度（bpr）的使用），以实现每侧40磁道的磁盘驱动器和相关信息处理系统之间的无格式盒式磁盘交换。封装在保护封套中且具有两个记录表面的双面软磁盘盒是专门用于数字记录和再现设备的类型，该设备采用能够定位到这些数据轨道的访问机制。

Specifies the general, physical, and magnetic requirements for the interchangeability of the two-sided, 5.25-in (130-mm) (nominal), 48-tracks-per-inch (tpi) (1,9-tracks-per-millilmeter (tpmm)) flexible disk cartridge (for 7958 bits-per-radian (bpr) use) as required to achieve unformatted disk cartridge interchange among disk drives using 40 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.