Patent ID: 7131014

Claim:
A storage system, comprising: controller configured to transfer data to a plurality of storage regions; at least one data line being used to relay data transferred from said controller; a plurality of disk drive units coupled to said at least one data line and each having a disk drive which has some of said storage regions; at least one first AC/DC power supply being inputted AC input and supplying said disk drive units with DC power; at least one first power line coupled to said at least one first AC/DC power supply and said disk drive units and being used to relay DC power to said disk drive units; a first DC power supply coupled to said at least one first power line and corresponding to a first disk drive unit of said disk drive units and supplying said first disk drive unit with DC power which is less than inputted DC power; and a first disk drive, in said first disk drive unit, and some other disk drives in said disk drive units forming an ECC (Error Check and Correct) Group; wherein said at least one first power line is used to relay DC power from said at least one first AC/DC power supply to said disk drive units, if a part related to said first disk drive unit does not have a failure, and wherein said at least one first power line is used to relay DC power from said at least one first AC/DC power supply to said disk drive units except said first disk drive unit, if said part related to said first disk drive unit has a failure.