Patent ID: 7167958

Claim:
A second storage comprising: a plurality of nonvolatile data storing means; a controller of the nonvolatile data storing means; an internal network for interconnecting the nonvolatile data storing means with the controller, wherein the controller includes a plurality of network transportation ports connected to different networks, respectively, an access controller for processing I/O commands requested for the transportation ports, and an access controlling table for storing access control setting information which defines the I/O commands that are to be authorized between each of the plurality of transportation ports and each of the plurality of nonvolatile data storing means; and a manager coupled to said controller for setting or changing said access control setting information, wherein the different types of I/O commands include READ and WRITE and the access control setting information includes READ only enable or READ and WRITE only enable information for each of the network transportation ports, said READ only or said READ and WRITE only information being changed by the manger, and wherein the controller controls to allow or deny access sent via the network based on said READ only or READ and WRITE only information.