ANSI X3.181-1990
信息系统.信息交换用已记录磁带和盒式磁盘.MFM编码的,1/2英寸(12.65mm),串行螺形,22道,6667bpi(262bpmm)和48道,10000bpi(394bpmm).记录要求
Information Systems - Recorded Magnetic Tape and Cartridge for Information Interchange - 1/2 Inch (12.65 mm), Serial Serpentine, 22-Track, 6 667 bpi (262 bpmm) and 48-Track, 10 000 bpi (394 bpmm), MFM-Encoded - Requirements for Recording