Patent ID: 7761614

Claim:
An electronic apparatus detachably connected to a host apparatus, comprising: a wireless communication module configured to communicate wirelessly with at least one external device; an information retrieving module configured to retrieve, by wireless communication with the at least one external device, metadata corresponding to each of content data items which the at least one external device is able to provide; a file management information generation module configured to generate, based on each of the retrieved metadata, file management information based on which the host apparatus recognizes each of the content data items as a file stored in a storage medium in the electronic apparatus, the file management information being indicative of a plurality of starting storage locations on the storage medium corresponding to starting data blocks of the content data items, and a plurality of shared storage locations on the storage medium, which are shared by the content data items and correspond to second and following data blocks of each of the content data items; and an access control module configured to retrieve, when the access control module has received a first read request designating one of the plurality of starting storage locations, which is sent from the host apparatus based on the file management information, the content data item corresponding to the designated starting storage location from the at least one external device with use of the wireless communication module, and to output the starting data block of the retrieved content data item to the host apparatus, and configured to output, when one of the plurality of shared storage locations is designated by a subsequent second read request from the host apparatus, the data block in the retrieved content data item, which corresponds to the designated shared storage location, to the host apparatus.