Data storage device comprising extended servo burst field over part of a disk surface

A method of operating a data storage device, the method comprising:

• when a head is over a first radial band of servo tracks, servoing the head over a disk surface based on a first read element reading a first servo sector and a second read element concurrently reading a second servo sector different from the first servo sector;
• and
• when the head is over a second radial band of servo tracks, servoing the head over the disk surface based on the first read element reading a third servo sector, wherein:
• the disk surface comprises a plurality of servo tracks defined by servo sectors including the first and second radial bands of servo tracks, wherein:
• each servo sector comprises a servo burst field;
• and
• across the first radial band of the servo tracks, the servo burst field comprises a first length;
• and
• across the second radial band of the servo tracks, the servo burst field comprises a second length longer than the first length;
• and
• the head comprises the first read element and the second read element offset radially from the first read element when the head is over the first radial band of the servo tracks.

Control circuitry for use in a data storage device, the control circuitry configured to:

• when a head is over a first radial band of servo tracks, servo the head over a disk surface based on a first read element reading a first servo sector and a second read element concurrently reading a second servo sector different from the first servo sector;
• and
• when the head is over a second radial band of servo tracks, servo the head over the disk surface based on the first read element reading a third servo sector, wherein:
• the disk surface comprises a plurality of servo tracks defined by servo sectors including the first and second radial bands of servo tracks, wherein:
• each servo sector comprises a servo burst field;
• and
• across the first radial band of the servo tracks, the servo burst field comprises a first length;
• and
• across the second radial band of the servo tracks, the servo burst field comprises a second length longer than the first length;
• and
• the head comprises the first read element and the second read element offset radially from the first read element when the head is over the first radial band of the servo tracks.