To provide an information leakage prevention system capable of certainly preventing information leakage by unknown malware.

This information leakage prevention system has: a means producing virtual disks respectively corresponding to applications stored in a storage device, and forbidding access to a physical hard disk or the virtual disk associated to a different application; a means transferring data to the virtual disk associated to the different application from the virtual disk associated to an arbitrary application according to setting of a user; and a means erasing all the virtual disks in time of completion of an operating system.

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