Patent ID: 8862864

Claim:
A computer comprising: a processor; an input device; a hard disk drive (HDD) comprising a hard disk, the hard disk comprising a first storage area, a second storage area, and a boot block storage area, the HDD storing, in the first storage area, an operating system (OS) to be executed by the processor, the HDD storing, in the second storage area, restoration software to execute processing to restore the OS to a predetermined state for system recovery by using data for restoring the OS, and the HDD storing, in the boot block storage area, a boot block having information indicating which storage area is active; and a storage section storing a program that is allowed to be activated when a specific instruction for system recovery is detected and to cause an activation of the restoration software, the information of the boot block being changeable according to an indication of the program, wherein the program comprises a signature that indicates a source of the program.