Removable media, formatting device, formatted system, formatting method, and formatting program

Without the host device equipped with a special format for commands, it provides a removable medium that can perform format compliant. An information storage unit 20 having a second storage area for storing the first memory area and the second management information which stores first management information, for formatting the first storage area and second storage area a format information storage unit 30 for storing the format information, the format start detection unit 11 for detecting the update access for updating the first management information from the external device, if the update access is detected, the format information storage the format information stored in the section 30 has a configuration having a first management information and the format processing unit 12 to the first storage area and the second formatting process to be stored in the memory area performed as the second management information.