GB/T 15134-1994 in English

《GB/T 15134-1994信息处理 信息交换用软磁盘文卷结构和标号》由TC28（全国信息技术标准化技术委员会）归口，TC28SC23（全国信息技术标准化技术委员会光盘分会）执行，主管部门为国家标准化管理委员会。
一组物理记录。这些物理记录的地址构成连续递增的序列

Scope

In order to facilitate the exchange of information between users of different information processing systems, this standard specifies the structure and labels of floppy disk files, including: a. Labels for identifying files, file sections and floppy disk volumes; b. Blocks Basic characteristics; c. File structure. This standard specifies three nested exchange levels: a. The first level is called the basic exchange level (B1), at which only a basic set of facilities can be used for data exchange; b. The second level is called In order to expand and exchange level 1 (E1), in addition to using a basic set of facilities at this level, it is also necessary to use facilities whose block length is longer than physical records and fixed-length block records for data exchange; c. The third level is called Extended exchange level 2 (E2), at this level, in addition to using the facilities of B1 and E1, it is also necessary to use the facilities of variable-length records and segment records to exchange data.