Patent ID: 7111081

Claim:
A storage device that is communicably connected to a host computer, comprising: a plurality of disk units for storing data from the host computer, each of the disk units comprising a plurality of hard disks and being connected to one of a plurality of ports; a plurality of disk unit control units for controlling the disk units, each of the disk unit control units being provided for each of the ports and comprising a memory for temporarily holding data from the host computer; and a plurality of control signal transmission cables for transmitting control signals from the disk unit control units to the disk units, wherein at least one of the control signal transmission cables is connected to at least two of the disk unit control units and transmits different control signals to at least two of the disk units, wherein each of the disk units further comprises a port control circuit and a port bypass circuit in addition to the plurality of hard disks, wherein each of the disk unit control units further comprises: a port control logic circuit for outputting a port control signal to the port control circuit of each of the disk units, a fiber channel control logic circuit for outputting a fiber channel control signal to the port bypass circuit of each of the disk units, wherein said at least one of the control signal transmission cables is a port control signal cable for transmitting different port control signals from the port control logic circuits of said at least two of the disk unit control units to the port control circuits of said at least two of the disk units.