Patent ID: 6392833
Filing Date: 2002-05-21
Classification: G11B

Abstract:
A method for improving operational performance of a disc drive having a spindle motor which controllably rotates a recording disc, the method comprising steps of:(a) initializing the disc drive by applying current to the spindle motor to accelerate the disc from rest to a nominal operational rotational velocity; (b) operating the disc drive as temperature of the disc drive increases from an initial, ambient temperature to an equilibrium temperature; and (c) during the operating step (b), before the temperature of the disc drive reaches the equilibrium temperature: (c1) detecting presence of a self-excited mechanical resonance within the disc drive as a result of the disc rotating at the nominal operational rotational velocity; (c2) decreasing the rotational velocity of the disc to a reduced operational rotational velocity less than the nominal operational rotational velocity to reduce effects of the self-excited mechanical resonance; and (c3) restoring the rotational velocity of the disc to the nominal operational rotational velocity.