BS 7081-2-1989
利用IMFM法以252次磁通变换mm(6400次磁通变换/in)速率录制的数据交换用6.30mm(0.25in)磁带盒的建造和应用指南.以起始/终止方式进行的数据交换用磁道格式和录制方法
Guide to construction and use of 6.30 mm (0.25 in) magnetic tape cartridge for data interchange, using IMFM recording at 252 ftpmm (6400 ftpi) - Track format and method of recording for data interchange in start/stop mode