Patent ID: 7023642

Claim:
A storage system communicably connected to a host computer, comprising: a disk unit section having a plurality of hard disks and storing data transmitted from the host computer; a disk-unit-section control section having a memory and performing control of the disk unit section, the memory temporarily holding data transmitted from the host computer; and direct-current power supply parts for supplying electric power of predetermined voltage to the disk unit section, wherein disk cases in which respective ones of the hard disks of the disk unit section are housed respectively have a plurality of corresponding direct-current voltage/direct-current voltage conversion parts which are connected to the direct-current power supply parts and a corresponding disk case, and convert the electric power supplied from the direct-current power supply parts into electric power of a predetermined corresponding voltage and supply the electric power of the predetermined corresponding voltage to the corresponding disk case, and the plurality of hard disks are collectively spun up when the disk unit section is started, wherein the disk unit section further has a plurality of disk drive parts each having a power source state detecting part which detects whether each of the direct-current voltage/direct-current voltage conversion parts and each of the direct-current power supply parts are in their normal states.