Patent ID: 6181504
Filing Date: 2001-01-30
Classification: G11B

Abstract:
A method of measuring track pitches of a hard disk drive to detect more accurately the position error signals on each disk, comprising the steps of:calculating said track pitches in accordance with selected heads and selected zones of said hard disk drive, each one of said zones being a distinct portion of each disk of said hard disk drive, each one of said heads corresponding with a surface of one of said disks;comparing said track pitches calculated according to heads with a first reference track pitch, said first reference track pitch being measured and averaged over all of the disks according to heads;comparing said track pitches calculated according to zones with a second reference track pitch, said second reference track pitch being measured and averaged over all of the disks according to zones;employing said first reference track pitch to said compared track pitches calculated according to heads when calculation of track pitches do not exceed said first reference track pitch;employing said second reference track pitch to said compared track pitches calculated according to zones when calculation of track pitches do not exceed said second reference track pitch; andupdating only track pitches corresponding to the comparing steps of heads and zones when calculation of track pitches exceed any one of said first or second reference track pitches.