Abstract: Control system/method for controlling disk spindle motor speed in a disk drive system using transducers riding or flying upon the disks, with a viscous substance between the disks and the transducers thereby exerting a load upon the spindle motor, the load having a non-uniform profile from the disk inner diameter to the outer diameter where the load at any location across the disk is a function of the medium upon which the transducers ride or fly above the disks, the location itself and the physical environment being experienced by the medium at any given instant of time. The control system provides speed control data that defines the power applied to the spindle motor to maintain a desired motor speed as a function of the presently selected track address and a controller that provides and selects for a presently selected track address the speed control data to the spindle control system to maintain the spindle motor speed at the specified speed.

Abstract: For a computer system or a subsystem thereof having electrical components, a method and apparatus for a collection of event driven software state machine of the type where each state machine is separately operable at differing levels of power consumption, and where the transitions from state to state are as a direct result of input events. Each of the state machines is programmatically biased to operate the state machine at a lowest possible power, and state machines processing event of a higher priority do so at the expense of state machines processing events having a lower priority.