Abstract
In Hard Disk Drives (HDDs), carriage vibration in low frequency due to an air flow caused by disk rotation is one of the factors that deteriorate the head positioning accuracy. Reduction of the disturbance is necessary for increasing capacities of HDDs. We proposed a new control strategy using a dual stage actuator mechanism and an additional electromagnetic actuator which provides a rotating stiffness to a carriage and suppresses the flow-induced carriage vibration. We measured a flow-induced carriage vibration when the additional actuator was working and carried out simulations of head positioning errors. It was confirmed that head positioning errors by flow-induced carriage vibration was reduced more than 30% compared with a dual stage actuator system.
