According to one embodiment of the present invention, there is provided a
power management system for use in a computer system having a memory
system incorporating a non-volatile memory and a controller which
presents the logical characteristics of a disc storage device to a host,
the power management system comprising means for monitoring the
operational activity levels within at least some of the components of the
controller and arranged, in response to the monitored levels, to vary the
power consumed by selected components of the controller.