Patent ID: 7447835

Claim:
A portable storage device comprising: a main unit including a receiving and ejecting device that receives a storage cartridge from an outside of said main unit into a predetermined inner position within said main unit, and ejects said storage cartridge out of said main unit from the predetermined inner position, and a storage operation control device that controls storage operation for storing data in said storage cartridge, wherein said storage cartridge includes a storage medium, another storage medium storing format information and access right information of said storage medium, a storage medium control device that performs writing of data in said storage medium and reading of data from said medium, and a casing that contains said storage medium and said storage medium control device; an accessibility determining device that determines whether or not access to contents recorded on said storage medium can be gained based on the format information and the access right information stored in the another storage medium, wherein said accessibility determining device tries to access said storage medium to determine whether or not the access can be gained, when said accessibility determining device cannot determine that the access can be gained based on the format information and the access right information; and a reception inhibiting device that inhibits said receiving and ejecting device from performing the receiving operation when said accessibility determining device determines that the access can not be gained.