Patent ID: 6292320
Filing Date: 2001-09-18
Classification: G11B

Abstract:
In a disk drive having a plurality of disk surfaces, a head actuator having a first stage actuator means and a plurality of head arms rotatable in unison about a pivot by the first stage actuator means, each head arm having a head for reading and writing on a respective disk surface, each head independently movable by a respective second stage actuator means, a radial offset table for storing mutual radial offsets between heads, and a servo controller for reading servo signals from a head for positioning the first and second stage actuator means, a method to adjust the radial offset of a head for performing a head switch from a first head to a target head over a target track, the method comprising the steps of:a) reading a radial offset for the target head from the radial offset table;b) calculating an offset compensation signal for the target head second stage actuator for positioning the target head based on the radial offset; andc) applying the offset compensation signal to the target head second stage actuator before the head switch occurs from the first head to the target head.