Patent ID: 6122127
Filing Date: 2000-09-19
Classification: G11B

Abstract:
In a disc drive of the type having a disc and an actuator adjacent the disc, the actuator including a head and a coil of a voice coil motor for selectively positioning the head with respect to data tracks on the disc, the disc drive having a preamp circuit for applying electrical currents to the head during read and write operations and a processor for digitally controlling selected operations of the disc drive, a method for dynamically programming the magnitude of a head current comprising steps of:(a) providing an input value representative of a desired value for the magnitude of the head current;(b) generating a reference voltage;(c) multiplying the reference voltage by the input value to generate an output voltage; and(d) controlling the magnitude of the head current in relation to a differential voltage between the reference voltage and the output voltage, wherein different magnitudes of head current can be selectively applied as the head is positioned adjacent different data tracks on the disc.