NBN-EN 27487-3 A1-1994
信息处理:用改进的调频制.以双面7958ftpred.19tpmm(48tpi)的记录方式.在130mm(5.25in)的软磁盘存储器上进行数据交换.第3部分:磁道格式B(ISO 7487:3:85)
Information processing: using improved frequency modulation. With double-sided 7958ftpred. 19tpmm (48tpi) recording method. Data exchange is performed on 130mm (5.25in) floppy disk memory. Part 3: Track Format B (ISO 7487:3:85)