We stripped 8 hard drives down the ascertain the most appropriate actuator for our application.
The arm from 4"drive as opposed to 2.5" drive allows more current resulting in greater amplitude this equals higher volume.
We built three versions of cutting head gaining improvements at every step.
A Google search revealed a patent listing that confirmed the problem of an audio dropout at around 8khz due to harmonic resonance introduced by the mechanical clamping of the tiny bearing between the arm and drive housing.
We eliminated the bearing all together, replacing it with a machined piece of flat aluminium clamped to the head between thin rubber shims.
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