Abstract: A head disk assembly includes a disk, a head stack assembly and a ramp-defining structure. The disk has a recording surface surrounded by an outer circumference and the head stack assembly has an actuator pivot axis and a head gimbal assembly. The head gimbal assembly includes a gimbal defining a gimbal axis parallel to and spaced a first distance from the actuator pivot axis, and a lift tab having a lift-surface portion spaced a second, larger distance from the actuator pivot axis. The ramp-defining structure includes a wall extending parallel to the actuator pivot axis, an axis-defining portion defining a retraction pivot axis and a shelf projecting from the wall to define a bearing surface against which the lift-surface portion slides during unloading and loading operations.