Patent ID: 6922301

Claim:
A disk drive comprising: a drive housing; a storage disk that is coupled to the drive housing, the storage disk including a storage surface having an inner diameter and an outer diameter; and a head stack assembly coupled to the drive housing, the head stack assembly including (i) a data transducer that is moved between the inner diameter and the outer diameter near the storage surface, (ii) an actuator pivot center, (iii) a longitudinal axis, (iv) a latitudinal axis that is substantially perpendicular to the longitudinal axis, the latitudinal axis intersecting the longitudinal axis at the actuator pivot center, the latitudinal axis dividing the head stack assembly into a transducer region that includes the data transducer and a positioner region, and (v) a positioner that causes movement of the data transducer, the positioner including a magnet array that generates a magnetic field, a primary coil array that interacts with the magnetic field to generate a primary force, and a secondary coil array positioned substantially within the positioner region, the secondary coil array interacting with the magnetic field to generate a secondary force having a net force component in a direction parallel to the longitudinal axis that remains substantially constant when the data transducer moves between the inner diameter and the outer diameter of the storage disk.