Methods of compensating for radial incoherence in servo information that
is read from adjacent servo tracks that have a phase offset relative to
one another on a data storage disk of a disk drive are provided. While a
transducer is seeking to a target track, the transducer generate a servo
information signal that has a first component from servo information read
from a first servo track on the disk and a second component from servo
information read from a second servo track that is radially adjacent to
the first servo track. The servo information in the first and second
servo tracks are offset by a non-zero phase error relative to one another
and are in a same servo sector on the disk. The servo information signal
is sampled to generate a series of sampled servo values. A phase error of
a group of the sampled servo values is determined. The sampled servo
values are compensated in response to the determined phase error to
generate compensated servo values with at least reduced phase error.