A magnetic tape cartridge includes a cartridge casing formed by upper and lower casing halves and a single reel around which a magnetic tape with a leader pin fixed to its leading end is wound and which is contained in the cartridge casing for rotation. The pedal unit is made up of an upper retainer piece, a lower retainer bracket, with footplate attached and two roughly parallel arms, which are each rotatably mounted at one end on the upper retainer piece and at the other end on the lower retainer bracket. The indented portion has a frustum-conical shape and extends downwardly into the substantially circular-shaped member, and the substantially circular-shaped member has an opening for receiving the stub axle of a spit assembly defined therein. Prior to commit, the computed retention date is stored in the file’s \u201clast access time\u201d propertyattribute field, or another metadata field that remains permanently associated with the file and that, in being used for retention date, does not interfere with file management in a WORM state. If the manual image sensing mode was set, image sensing conditions stored in memory when last shutting down the apparatus are read and set in the image sensing apparatus. Each of the criterion is then associated with a value obtained by the first or second matching method to create at least one criterion-value pair, and structured data is created based on the at least one criterion-value pair.