The dynamics of a disk drive actuator are enhanced by redistributing the
mass and stiffness of the structure. The two nodal points of the second
primary bending mode of the actuator are relocated to positions that are
both radially outboard of their original positions. One nodal point is
positioned as close to the read-write head as possible at one end of the
actuator, and the other nodal point is positioned at the center of the
active legs of the VCM coil at the other end of the actuator. This is
done to reduce the off-track displacement associated with this
fundamental resonance to near zero, allowing higher track densities to be
supported.