Data storage device comprising dual read sensors and dual servo channels to improve servo demodulation

摘要

A data storage device is disclosed comprising a disk comprising a plurality of servo tracks defined by servo sectors, wherein each servo sector comprises a plurality of servo bursts. A head comprises a first read sensor and a second read sensor separated from the first read sensor by a cross-track spacing. A first servo channel processes a first read signal emanating from the first read sensor to generate a first position signal based on at least two servo bursts read using the first read sensor. A second servo channel processes a second read signal emanating from the second read sensor to generate a second position signal based on at least two servo bursts read using the second read sensor. A position error signal (PES) is generated based on the first position signal and the second position signal, and the head is servoed over the disk based on the PES.

主权项

1. A data storage device comprising:
a disk comprising a plurality of servo tracks defined by servo sectors, wherein each servo sector comprises a plurality of servo bursts; a head comprising a plurality of read sensors including a first read sensor, and a second read sensor separated from the first read sensor by a cross-track spacing; a first servo channel configured to process a first read signal emanating from the first read sensor to generate a first position signal based on at least two servo bursts read using the first read sensor; a second servo channel configured to process a second read signal emanating from the second read sensor to generate a second position signal based on at least two servo bursts read using the second read sensor; and control circuitry configured to:
generate a position error signal (PES) based on the first position signal and the second position signal; andservo the head over the disk based on the PES.