Patent ID: 7681061

Claim:
A storage system, comprising: a 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 housings 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 housings with DC power; at least one first power line coupled to said at least one first AC/DC power supply and said disk drive housings and being used to relay DC power to said disk drive housings; at least one second AC/DC power supply being inputted AC input and supplying said disk drive housings with DC power; at least one second power line coupled to said at least one second AC/DC power supply and said disk drive housings and being used to relay DC power to said disk drive housings; and a first DC power supply coupled to said at least one first power line and said at least one second power line and corresponding to a first disk drive housing of said disk drive housings and supplying said first disk drive housing with DC power which is less than inputted DC power, 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 housings, if a part related to said first disk drive housing does not have a failure, 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 housings except said first disk drive housing, if said part related to said first disk drive housing has a failure, wherein said plurality of disk drive housings, said at least one first power line and said at least one second power line are provided in a disk drive unit housing, and wherein a plurality of such disk drive unit housings are provided within the storage system.