Patent ID: 7003671

Claim:
An information processing device for supplying management information to a data storage device, said information processing device comprising: forming means for forming management information that manages a storage area in the data storage device in a layered structure, said storage area divided into a plurality of system blocks and a plurality of user blocks; encrypting means for encrypting said management information, said encrypting means encrypting a lower layer of the management information by using a key contained in an upper layer of the management information; communication means for communicating the encrypted management information to said data storage device; and means for generating a check code to check whether the management information has been tampered with by a non-authorized user, wherein said encrypting means encrypts the check code together with the management information; wherein said plurality of user blocks are allocated in an ascending order, said plurality of system blocks are allocated in a descending order, and a boundary between the plurality of user and system blocks is variable; and wherein said plurality of system blocks are classified into at least three areas, a system defining block area, a defining block area, and a service defining block area.