A disk drive is disclosed including a disk having a plurality of servo
tracks. 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. The disk drive further comprises a
head attached to a distal end of an actuator arm operable to generate a
read signal by reading the disk, and a mechanical position sensor
operable to detect a coarse position of the actuator arm. The coarse
position is processed to identify one of the servo track bands, and the
read signal is processed to detect one of the fine track addresses,
wherein the detected fine track address identifies a servo track within
the identified servo track band. The identified servo track band is
combined with the detected fine track address to generate a servo track
address.