Patent ID: 8458237

Claim:
An information processing device comprising: a storage unit for storing a data file including readable content, and a control file including control information corresponding to the data file; and a data processing unit configured to use a filename conversion table, which stores filename conversion information, to: (1) convert the filename of a file stored in the storage unit into a name on a virtual file system (VFS); (2) construct the VFS that includes storage data of a disc and the data file of the storage unit; and (3) perform a data reading process; wherein the data processing unit: (1) compares the control information included in the control file and the data file stored in the storage unit; (2) updates the filename conversion table to reconcile the control information included in the control file and the data file stored in the storage unit; and (3) determines whether or not there is a discrepancy listing fewer files in the control information included in the control file than the data file stored in the storage unit, wherein the data processing unit further configured to confirm the validity of the filename conversion table through signature validation of a file tampering validation data before converting the filename of the file stored in the storage unit into the name on the VFS.