Patent ID: 6320712
Filing Date: 2001-11-20
Classification: G11B

Abstract:
A method for determining a rotational position of a magnetic storage medium divided into a plurality of servo sections, the method comprising the steps of:defining a predetermined bit pattern that corresponds to a known rotational position of the magnetic storage medium;associating a single rotational position indicator bit with each said servo section such that a known bit of the predetermined bit pattern is associated with the known rotational position of the magnetic storage medium;reading a current rotational position indicator bit from a first servo section on the magnetic storage medium;reading a second rotational position indicator bit from a second servo section on the magnetic storage medium, the second servo section being adjacent to the first servo section;forming a rotational position bit sequence comprising the current rotational position indicator bit and the second rotational position indicator bit;comparing the rotational position bit sequence with the predetermined bit pattern; andbased on the comparison, determining whether the rotational position of the magnetic medium is the known rotational position,wherein the rotational position bit sequence and the predetermined bit pattern each has a length of N bits, where N is defined based on a number of allowable bit errors.