Patent ID: 6122117
Filing Date: 2000-09-19
Classification: G11B

Abstract:
A method of demodulating a position signal in a magnetic disk device for reading first and second servo burst signals, which have been recorded in a servo area of a magnetic disk alternately in the radial direction, by a head, and demodulating a position signal, which indicates a deviation from a reference position on a track, using the first and second servo burst signals that have been read, comprising:digitally sampling the first and second servo burst signals, which have been read by the head, at a frequency two or more times greater than a servo burst signal frequency;calculating area information of each of first and second servo burst signal waveforms by summing absolute values of digitally sampled values of respective ones of the first and second servo burst signals; andcalculating, as a position signal, the difference between the area information of the first servo burst signal waveform and that of the second servo burst signal waveform.