Patent ID: 7047427

Claim:
A disk system comprising: at least one Hard Disk Drive (HDD) including a plurality of fibre channel interface ports; A HDD drive section having a plurality of fibre channel control sections, each of the fibre channel control sections having a fibre channel interface and a fibre channel control interface; a first power supply, in the HDD drive section, supplying power to the HDD drive section; a HDD control logic section including a plurality of HDD control logics that each controls read/write accesses to the at least one HDD via at least one fibre channel interface and at least one of the fibre channel ports; a second power supply, in the HDD control logic section, supplying power to the HDD control logic section; a power source control circuit, in the HDD drive section, that controls to supply power to the HDD drive section from the first power; and a power switch controlling to start to supply power from the second power supply according to be inputted ON, wherein the at least one fibre channel interface corresponds to the at least one of the fibre channel interface ports, wherein the at least one fibre channel control interface controls to connect and disconnect between the at least one fibre channel interface and the at least one of the fibre channel interface ports based on a fibre channel control signal transferred from at least one of the HDD control logics via a signal line, wherein the at least one of the HDD control logics transfers a power control signal to the power source control circuit via the signal line, wherein the power source control circuit picks out the power control signal from the signal line and controls to supply power based on the power control signal, wherein the second power supply supplying power to the HDD control logic section and the power source control circuit according to be inputted ON via the power switch, and wherein the power source control circuit controls to supply power to the HDD drive section from the first power supply in conditions which the power source control circuit is supplied power from the second power supply.