| US 7,593,900 B2 | ||
| Host device, memory card, memory capacity changing method, memory capacity changing program and memory capacity charge giving/receiving method | ||
| Hiroko Okabayashi, Sagamihara (Japan); Tetsuya Kaise, Hino (Japan); and Akio Yazawa, Osato-gun (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Feb. 23, 2004, as Appl. No. 10/782,849. | ||
| Claims priority of application No. P2003-378572 (JP), filed on Nov. 07, 2003. | ||
| Prior Publication US 2005/0102232 A1, May 12, 2005 | ||
| Int. Cl. G06Q 40/00 (2006.01); G06F 13/00 (2006.01); G06F 13/28 (2006.01) | ||
| U.S. Cl. 705—41 [711/115; 711/163; 711/173] | 10 Claims |
| 1. A system for exchanging information with a memory card, the system comprising:
The memory card including
a usable area for saving user data, and
a security area for storing secret data, the memory card changing the capacity of the usable area by changing the capacity
of the security area, the system being accessible with the security area only when the system is authenticated according to
executing two-way authentication with the memory card;
a central processing unit including
a charge management module configured to receive payment of a charge corresponding to an increased amount of a usable area
when a capacity of the usable area of the memory card for saving user data is increased, and pay out a charge corresponding
to the reduced amount of the usable area when the capacity of the usable area is reduced; and
a transmission module configured to transmit an area changing command to instruct an increase or a reduction of the usable
area in accordance with the charge to the memory card.
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