Seagate Technology Incorporated

Mike E Baum

David L Schell

John Christopher Morris

Abhay Tejmal Kataria

Peter Michael Young

Chris Thomas Settje

Steven Alan Koldewyn

Marinko Bosnich

Kar Wei Koay

An apparatus and method for dynamic head switch timing recalibration are provided. With the apparatus and method, a determination is made as to whether a difference in a reference head switch timing and the head switch timing at a later time is sufficient to meet a certain criteria. If the difference meets the criteria, a recalibration of the head switch timing is performed. For example, in a preferred embodiment, the criteria is a number of address mark (AM) misses during a head switch operation. If this predetermined number of AM misses is detected, then it is determined that a recalibration is necessary since the predetermined number of AM misses is an indication that the head switch timing has changed significantly from the reference head switch timing.

Dynamic head switch timing recalibration apparatus and method

A method of configuring a discrete-time servo controller in a fixed-point digital signal processor (DSP) for controlling a servo actuator in a disc drive includes obtaining a stable, closed-loop representation of the servo controller and the servo actuator. Bounds on the controller states are derived from the stable closed-loop representation. The controller states are scaled based on the controller state bounds, and the servo controller is configured in the DSP based on the scaled controller states.

Closed-loop scaling for discrete-time servo controller in a disc drive

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Longmont, CO, United States of America

Mike E Baum