Patent ID: 7346721

Claim:
A method of connecting a storage device to a host computer, comprising: a first connection processing for enabling a host to interface in advance before said storage device is ready; and a second connection processing for enabling said host to interface after said storage device is ready, wherein the first connection processing is carried out when a power supply to said storage device is turned on; the second connection processing is carried out when said storage device is at a hot plug time; said storage device comprises at least two controllers; one of said controllers obtains state information of other said controllers, and decides whether the other said controllers are in an online state; when other systems are in the online state, an own system is changed to a build-in state, and a connection to a host computer is started, and when other systems are not in the online state, a normal processing is carried out, and a connection to said host computer is started; and when an own system is not in the build-in state among at least two said controllers, the first connection processing is carried out to connect said storage device to said host computer, and when an own system is in the build-in state, the second connection processing is carried out to connect said storage device to said host computer.