System for improving accuracy of servo pattern timing reference in a disc drive

摘要

It is generally believed that, the more pure the servo pattern timing reference, the better. A system writes a servo clock track on a disc in a disc drive. The clock track is written on the disc and the servo system is configured to reduce a splice error in a timing signal based on the clock track. The system is also configured to reduce phase-locked oscillator (PLO) jitter in the timing signal.In one embodiment, the splice error and PLO jitter are both measured using a single phase measurement circuit.