Apparatus and method for compensating for positional indicia misplacements
in the positioning of a control object, such as with servo seam
misplacements on a data storage device storage medium. An actual position
for the control object is determined in relation to a corrected commanded
position of the control object and a corrected position error of the
control object. The corrected commanded position is determined in
relation to a gain error and an actual commanded position, and the
corrected position error determined in relation to the gain error and an
actual position error. Preferably, an actual position error of the
control object is next determined in relation to the actual position, and
the control object is moved to reduce the actual position error. The
positional indicia preferably comprise AB and CD seams of ABCD servo
dibit patterns on a recording surface.