Patent ID: 7320093

Claim:
A storage apparatus, comprising: a storage control unit; and a storage unit composed of a plurality of physical storage devices, wherein said storage control unit includes: a host interface control unit for controlling a data transfer with a host device; a disk interface control unit for controlling the data transfer with said storage unit; a cache memory for temporarily storing said data; and a data transfer unit which is connected to said host interface control unit, said disk interface control unit, and said cache memory, and controls the data transfer, said storage unit is provided for each power source line to said plurality of physical storage devices and includes a switch for shutting the power supply to said physical storage device when an excess current to said physical storage device is detected and a power source line monitor circuit for monitoring a voltage of said power source line, and when a voltage abnormality due to a voltage drop of said power source line is detected by said power source line monitor circuit, a data line connecting said disk interface control unit and said plurality of physical storage devices is cut off.