EXTENDED POSITION ERROR SIGNAL FOR ANALOG SERVO DISK DRIVE

A system and method of extending the position error signal for a disk drive storage system using two digital-to-analog converters in a summing junction, including a typical A-B signal and a track error signal scaled to match a gain of the A-B signal. A track error is calculated. The track error is output to a second digital-to-analog converter. The A-B signal is inverted according to the least significant bit of the grey code of a disk track being read. The inverted A-B signal is output to a first digital-to-analog converter. The inverted A-B signal and the track error are combined using a summer to generate a combined signal. The combined signal is used to generate an extended position error signal.