GB/T 15131.2-1995
信息处理 数据交换用130mm改进调频制记录的位密度为13262磁通翻转/弧度、每面80条磁道的软磁盘 第2部分:磁道格式A (用于77条磁道)
Information processing--Data interchange on 130mm flexible disk cartridges using modified frequency modulation recording at 13262 ftprad, on 80 tracks on each side--Part 2: Track format A for 77 tracks
GBT15131.2-1995, GB15131.2-1995