Patent ID: 6538835
Filing Date: 2003-03-25
Classification: G11B

Abstract:
In a disc drive having a plurality of axially aligned rotatable data recording surfaces on which nominally concentric tracks are defined and accessed by respective read/write magneto-resistive heads supported by a common, moveable actuator, a method for carrying out a seek wherein a first head is moved from an initial track to a first destination track on a first data recording surface, comprising steps of:(a) applying a read bias current to the first head to transduce servo data on the first recording surface to detect radial position of the first head as the first head is moved across the first recording surface; (b) decelerating the first head to rest when the first head unsuccessfully transduces the servo data sufficiently to determine the radial position of the first head; (c) switching from the first head to a second head and applying a read bias current to the second head to transduce servo data on a second recording surface to detect radial position of the second head as the second head is moved across the second recording surface; (d) switching from the second head to the first head when the second head is positioned at a known radial relation to the first destination track on the first recording surface; and (e) positioning the first head over the first destination track on the first recording surface.