An actuator assembly for use in a disk drive includes a first read head
and a coarse actuator. The coarse actuator includes a coarse actuator
body and a first actuator arm extending away from the coarse actuator
body. The first actuator arm has a proximal end attached to the coarse
actuator body and a distal end. The actuator assembly further includes a
first microactuator attached to the distal end of the first actuator arm.
The first microactuator supports the first read head. The actuator
assembly further includes a first force-balancing microactuator attached
to the distal end of the first actuator arm without any read head
attached to the first force-balancing microactuator.