Entertainment system which includes an information processing unit capable of communicating with detachable portable storage device even after insertion of a different portable storage device

摘要

A portable storage device is detachably connectable to an information processing unit such that when a file management system is loaded into a main storage device of the portable storage device, a particular value is written to a register, a central processing unit (CPU) checks if the contents of the register coincides with the particular value, the CPU accesses a flash ROM (read only memory) if they are in coincidence, and the CPU re-loads the file management system if they are not in coincidence.