Patent ID: 7823209

Claim:
A non-transitory information recording medium storing data which can be accessed from an accessing device, comprising: a storage device configured to store data and having plural areas respectively managed by independent file systems; an area information storage configured to store information about size and position of each area of the storage device; a host interface configured to receive a command for setting a size of each area of the storage device from the accessing device; an area size setter configured to set size and position of each area of the storage device based on a predetermined setting condition according to the command received from the accessing device; and an authentication controller configured to authenticate the accessing device, wherein the storage device has an authentication area which allows access from the accessing device only when authentication by the authentication controller is successful, and a non-authentication area which allows access from the accessing device regardless of a result of the authentication by the authentication controller, wherein the non-authentication area and authentication area individually have plural areas, and each area in the non-authentication area has a corresponding area in the authentication area, wherein the predetermined setting condition comprises a ratio of a size of an area included in the non-authentication area to the size of the corresponding area included in the authentication area, wherein the host interface receives the size of one area in the non-authentication area or authentication area from the accessing device, and wherein the area size setter determines the size of each area in the non-authentication area and authentication area on the basis of the received size of one area and the ratio, and sets the information to be stored in the area information storage on the basis of the received size and determined size.