Abstract: A track servoing system is disclosed which is particularly useful with floppy disk memories. The system improves the positioning accuracy of a read/write head during a reading operation through the use of tunnel erase heads as read heads. The tunnel erase heads are positioned on either side of the read/write head and their outputs are differentially measured to provide direction and magnitude information to servo positioning electronics. The invention is particularly reliable in reading eccentric variations in data tracks caused by environment, i.e., humidity, temperature, etc.