不归零制记录 meaning in English

non return to zero recording
non-return to reference recording

On 9 track nonreturn to zero recorded magnetic tape for digital data storage , density 8 rpmm 200rpi
数字数据存储用9磁道的不归零制记录磁带.位密度8位
On 7 tracks nonreturn to zero recorded magnetic tape for digital data storage , density 8 rpmm 200 rpi
数字数据存储用7磁道不归零制记录磁带.密度8rpmm 2
On 9 tracks nonretorn to zero recorded magnetic tape for digital data storage , density 32 rpmm 800 rpi
数字数据存储用9磁道的不归零制记录磁带.位密度32位