Abstract: Head position controlling system for a disc memory unit in which reference information recorded on a recording disc is read out by a head to control tracking of the head. In the case of recording data on the recording disc, a first repetitive pattern signal is recorded on the disc while maintaining a predetermined position relationship with respect to a pair of adjacent data tracks to form an N-th reference track on the disc and then a second repetitive pattern signal is recorded on the disc to form (N-1)-th and (N+1)-th reference tracks adjacent to the N-th reference track. The second repetitive pattern signal is shifted in position so as not to be adjacent to the first repetitive pattern signal.