Patent ID: 7760461

Claim:
A disk drive comprising: (a) a disk comprising a plurality of servo sectors having servo bursts for defining a plurality of servo tracks, wherein: the servo tracks are banded together to form a plurality of servo track bands; and each servo sector comprises a fine track address that identifies one of the servo tracks; (b) an actuator arm; (c) a head attached to a distal end of the actuator arm operable to generate a read signal by reading the disk; (d) a mechanical position sensor operable to detect a coarse position of the actuator arm; and (e) control circuitry operable to: process the coarse position to identify one of the servo track bands; process the read signal to detect one of the fine track addresses, wherein the detected fine track address identifies a servo track within the identified servo track band; combine the identified servo track band with the detected fine track address to generate a servo track address; and detect a physical shock to the disk drive in response to the mechanical position sensor.