Patent ID: 7685390

Claim:
A storage system having a storage device and a first controller that controls data transmission between the storage device and an information processor, wherein the storage device comprises: a storage area; a control circuit for controlling the writing of data to the storage area and the reading of the data from the storage area; a second controller for outputting a first control signal for executing data writing to the control circuit through a first control line; and outputting a second control signal for executing data reading to the control circuit through a second control line; a disconnecting element, which is located at a midpoint on at least the first control line, from among the first and second control lines, for disconnecting the control line; and a drive circuit for driving the disconnecting element, and based on a command from the first controller, the second controller outputs to the drive circuit a third control signal for disconnecting the control line using the disconnecting element, wherein the first controller provides a plurality of logical volumes to the information processor; a specific logical volume to be write protected is set from among the logical volumes; a storage device providing the storage area to the write-protected logical volume is specified; and the first control line in the specified storage device is disconnected by the disconnecting element.