Patent ID: 6061196
Filing Date: 2000-05-09
Classification: G11B

Abstract:
A system for recording and/or reproducing information, comprisinga magnetizable medium provided with a track pattern comprisingburied servotracks of a first type containing a signal, andburied servotracks of a second type containing a second signal,which servotracks extend substantially in a longitudinal direction and which track pattern, in a transverse direction perpendicular to the longitudinal direction, alternately comprises a servotrack of the first type followed by a servotrack of the second type, and an apparatus comprisinga magnetic head unit comparing a plurality of heads at different positions in the transverse direction,means for moving the medium relative to the magnetic head unit in the longitudinal direction, andan actuator for moving the magnetic head unit relative to the medium in the transverse direction, anda control unit for controlling the actuator, which control unit is adapted to generate a position signal based on the difference between the signals of two heads,characterized in thatthe track pattern comprises a group of at least two bands of a first type separated by a band of a second type, which bands of the first type adjoin a servotrack at their sides remote from the band of the second type,the bands of the first type comprising N1 servotracks having a first typical width W1,the bands of the second type comprising N2 servotracks having a second typical width W2 which complies withN2=an even number and W2=(k+1/2)W1N2=an odd number and W2=2k.W1,where k=an integer,and the center-to-center distance p between the heads complies with the relationship p=n.multidot.W1, where n=even number.