Structures and methods for creating a vertical offset between suspension
springs or fingers within a suspension head assembly for use in a disk
drive are disclosed, the vertical offset helping to reduce track
mis-registration errors. The base plate and load beam may be made from
three-layer composite materials that have been etched to create either
recesses therein into which the suspension springs ends are placed and
then welded, or the base plate and load beam may be etched to create
mesas on which the ends of one of the suspension springs are welded. The
three layers may comprise stainless steel, polyimide, and stainless
steel. In another embodiment, one of the suspension springs is a
three-layer material that has been etched to create a raised central
portion that is vertically offset from the other suspension spring. In
another embodiment, spacers are employed as shims underneath one of the
suspension springs. Generally, at least one of a spring extension, the
load beam and the mount beam comprise a laminate material.