Patent ID: 7134032

Claim:
An information device having means for supplying power to a plurality of its components including an OS and driver, and a device driver, the information device characterized by comprising: access monitoring means for monitoring IO packets from a predetermined single one or a number of said components, and for detecting peak-power generating condition and peak-power terminating condition for the components; and power-mode changing means for switching mode of power, to the predetermined single one or number of said components, from a normal-power mode to a power-saving mode according to detected information from said access monitoring means on said peak-power generating condition, and for switching the power mode from said power-saving mode to said normal-power mode according to detected information from said access monitoring means on said peak-power terminating condition, wherein said access monitoring means monitors said IO packets between said OS and driver, and said device driver, wherein said predetermined single one or a number of said components is an information storage device, said access monitoring means is configured for: detecting issuance of a read/write request IO packet indicating occurrence of spin-up in the information storage device as the peak-power generating condition; and detecting issuance of a read/write completion IO packet as the peak-power terminating condition.