group coded record meaning in Chinese

成组编码记录

3 . 81mm , 8000bpi 315bpmm , information systems - recorded magnetic tape cassette for information interchange - 4 track , 0 . 150 inch 3 . 81 mm , 8000 bpi 315 bpmm , group code recording
信息系统.信息交换用已记录盒式磁带. 4道, 0 . 150英寸
6 . 30mm 8000bpi 315bpmm information systems - serial recorded magnetic tape cartridge for information interchange - 4 and 9 track , 0 . 250 inch 6 . 30 mm , 8000 bpi 315 bpmm streaming mode , group code recording
信息系统.信息交换用串行已记录盒式磁带. 4道和9道. 0 . 250英寸