Patent ID: 8683186

Claim:
A computer comprising: a processor; an input device; a storage medium storing a basic input/output system (BIOS); a hard disk drive (HDD) comprising a hard disk, the hard disk comprising a first storage area, a second storage area, a third 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, data for use in restoring the OS to a predetermined state for system recovery, and storing, in the third storage area, restoration software to execute processing to restore the OS to the predetermined state for system recovery by using the data, 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 program being different from the BIOS, 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.