Disk device, track positioning method and method for generating a position error signal

A disk device in which a position error signal is generated using burst patterns read out from a disk in which at least a pair of burst patterns are recorded on each of a plurality of tracks, and a head is positioned at a desired track according to said position error signal, said disk device comprising:

• a head disk controller for controlling said disk;
• and
• an MPU, coupled to the head disk controller,
• for detecting a burst pattern for generating a position error signal, the MPU further detecting a defect in one burst pattern of a burst pattern pair from said disk, for measuring the maximum amplitude value of a burst pattern other than the burst pattern having said defect detected and for generating said position error signal by using a burst pattern of the burst pattern pair without a defect.

A track positioning method for generating a position error signal by using burst patterns read out from a recording medium in which at least a pair of burst patterns are recorded on each of a plurality of tracks, and positioning a head by using said position error signal, said method comprising:

• measuring amplitudes of first and second burst patterns read out from said recording medium;
• detecting a defect of said first burst pattern;
• measuring the maximum amplitude of said second burst pattern;
• and
• generating said position error signal using said amplitude of said second burst pattern and said maximum amplitude of said second burst pattern.

A method for generating a position error signal by using a first burst pattern and a second burst pattern, said method comprising:

• measuring the amplitude of the first burst pattern;
• determining whether the second burst pattern has a defect;
• and
• generating a position error signal from the amplitude of said first burst pattern and the maximum amplitude of said first burst pattern when it is determined that said second burst pattern has a defect.