a dual actuator arm assembly system that uses two pairs of actuator - carriage arms that linearly move over a stationary micro - rail independently . the geometric shape of the two pairs of actuator carriage arms conform to the arcs of the data tracks at an acute angle . system enables micro - actuation that is integrated to actuator arm and is a function of its geometry . uninterrupted data stream and sector coverage and thus parallel data transfer scheme is made possible . each actuator move only within a limited range of disk area , thus precision is increased , vibration is minimized and external transfer rate is speeded up and overall access time is shortened . instant access to two quarters of the disk with two pairs of actuators and to park these without landing the heads — by positioning and constant fly height during idle mode , or when system is turned off , are introduced as what are new in the art .