Patent ID: 8601303
Filing Date: 2013-12-03
Classification: G06F

Abstract:
1. A storage system comprising: a basic apparatus that transmits an access request through an upper data input line to transmit data; and an extension apparatus that receives an access request from the basic apparatus through the upper data input line, the extension apparatus including a storage that stores data and a controller that controls the access request from the basic apparatus, the basic apparatus includes a first voltage superimposer that superimposes a voltage to the upper data input line to instruct the extension apparatus to be powered on in accordance with the access request and a first voltage detector that detects a specified voltage superimposed on an upper data output line to transmit data from the extension apparatus to the basic apparatus, and the extension apparatus includes a second voltage detector that detects the voltage superimposed on the data input line, a power controller that controls the power supply to the controller on the basis of the detected voltage, and a second voltage superinnposer that superimposes the specified voltage on the upper data output line when power supply to the controller is stoppable, and the basic apparatus stops superimposing the voltage to the upper data input line to instruct to power off the extension apparatus when the first voltage detector detects that the specified voltage on the upper data output line is superimposed.