Abstract: A memory card comprises an index area, and a data area including a plurality of extents in each of which data is recorded. The index area includes in correspondence with each of the extents, an area for entering a file name, a status indicating area for entering the number of bytes to be recorded per sector, and areas for entering the beginning and end addresses of the corresponding extent, respectively. The memory card is accessed in such a way that the index area is read to decide if a desired file name exists, and that the status indicating area is read subject to the existence of the desired file name. A control unit translates an address premised on a floppy disc into an address for accessing the memory card, on the basis of the number of bytes entered in the status indicating area, and then accesses the memory card.

Abstract: The information recording card of the present invention comprises a postcard or a blank form equal in size thereto, and a magnetic stripe which is stuck on one surface of the postcard or the blank form so as to extend along the shorter or longer latus thereof and in which the payment data of a specified charge is written. Such a magnetic stripe-stuck card is efficiently utilized for a specified charge making/paying system. In the charge making/paying system, the payment data of the specified charge is stored in the memory unit of a host computer which is installed in, e.g., the center of a public office, and the card whose magnetic stripe has the charge payment data written therein by a magnetic tape writer is mailed to a customer.