Patent ID: 7555483

Claim:
An information processing device in which a plurality of information recording media is simultaneously attached when said plurality of information recording media exists, wherein data stored in an information recording region is managed as a file by means of an individual file system, comprising: a plurality of slots which are provided in the body of said information processing device to attach the respective information recording media; a system memory which retains file system control information for recognizing individual file systems constructed in said plurality of information recording media and unifies and controls the individual file systems into a single virtual file system, wherein said file system control information includes: (1) slot information including a priority order retained in said file system control information showing a priority for use of the plurality of information recording media and system information showing a file system in said information recording media, and (2) open information showing information on opened files as well as flags for files having the same name; a file system controller which refers to said slot information and said open information, and which sets said flags and accesses a file in a logical information recording region of said information recording media based on the priority order when files having the same name exist in said plurality of information media; and an access controller which selectively accesses one of the plurality of slots and accesses an address in said information recording media designated by said file system controller, and acquires data of a file.