GB/T 17960-2000
信息技术 数据交换用90mm改进调频制记录的位密度为31831磁通翻转/弧度、每面80磁道的软磁盘 GB 303型
Information technology-Data interchange on 90mm flexible disk cartridges using modified frequency modulation recording at 31 831 ftprad on 80 tracks on each side-GB type 303
GBT17960-2000, GB17960-2000