FIG. 5A shows a data storage device in the form of a disk drive according to an embodiment comprising a first disk surface having a first set of servo sectors, and a second disk surface having a second set of servo sectors circumferentially offset from the first set of servo sectors by a phase offset unequal to 180 degrees.

FIG. 5B is a flow diagram according to an embodiment wherein a second PES generated from reading the second set of servo sectors is phase shifted to achieve a 180 degree phase offset, wherein the VCM is controlled using a first PES generated from reading the first servo sectors and the phase shifted PES.

FIG. 6A shows an embodiment wherein the second set of servo sectors are phase offset from 180 degrees by a delta phase.

FIG. 6B shows control circuitry according to an embodiment wherein at least the first head is servoed over the first disk surface based on the first PES and a phase shifted PES.

FIG. 7 shows control circuitry according to an embodiment wherein secondary actuators control respective heads based on respective PESs (including a phase shifted PES) generated from reading the first and second set of servo sectors.

FIG. 8A shows an embodiment wherein the data storage device may comprise two or more disks with heads actuated over respective disk surfaces.

FIG. 8B shows an embodiment wherein servo sectors are written to four disk surfaces in a staggered format.