| http://www.w3.org/ns/prov#value | - relative to the data tracks, and means for deriving from the servo information a digital head position error signal (PES), wherein the improvement comprises:a microprocessor coupled to the digital PES deriving means and responsive to the digital PES for generating a digital control signal, the microprocessor including means for estimating the VCM state variables, including VCM current, from predet
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