Patent ID: 6760186
Filing Date: 2004-07-06
Classification: G11B

Abstract:
A hard disk drive for storing information, the device comprising:a magnetic disk having a plurality of servo wedges positioned in substantially circular patterns forming concentric servo tracks and wherein a marker is formed on the disk to identify the location of the transition between the first and last servo wedges written on the servo track; a spindle which rotates the magnetic disk; a transducer for writing data to and reading data from the rotating magnetic disk; an actuator coupled to the transducer, wherein the actuator moves the transducer such that the transducer can be positioned over a selected region of the magnetic disk; and a control system that controls the positioning of the transducer over the magnetic disk by the actuator, wherein the control system receives signals from the transducer indicative of the transducer encountering the marker such that the control system is aware of the transition between the first and last written servo wedges of each concentric servo track on the magnetic disk such that the control system can thereby account for closure error occurring in the transition between the first and last servo wedges written on the servo track while controlling the positioning of the transducer.