A design methodology for reducing seeking noise in a hard disk drive has been developed. This method can optimize the seeking current according to a shockresponse-spectrum analysis. It was verified experimentally that this method can reduce the seeking noise by about 4 dBA on average without increasing the seeking time.

A new design method -based on a final-state control (FSC) -for short-span seeking in a hard-disk drive (HDD) has been developed. The short-span seeking is performed by two-degree-of-freedom (2-DOF) control, which uses a feedforward (FF) control input along with a reference trajectory. The design method can directly generate the FF control input, whose derivative at a specified order is minimized and whose power spectrum amplitude is reduced at a specified frequency. The residual vibration caused by mechanical resonance can therefore be reduced by the generated FF control input. Test with a 2.5-in form-factor HDD experimentally confirmed that the developed seeking control significantly reduces the residual vibration in a HDD.

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