1. A method for storing files in a storage device, the method comprising: dividing the storage device into an original partition, a first system partition and a second system partition; installing a plurality of original files in the original partition; establishing a first shortcut in each of the first system partition and the second system partition, the first shortcut pointing to a first original file of the plurality of original files; setting the second system partition to be a boot partition; replacing the first shortcut in the first system partition with a first updated file without writing files to the original partition; and setting the second system partition to be a non-boot partition, and setting the first system partition to be the boot partition; establishing a second shortcut in each of the first system partition and the second system partition, the second shortcut respectively pointing to a second original file of the plurality of original files; replacing the first shortcut in the second system partition with the first updated file and replacing the second shortcut in the second system partition with a second updated file; and setting the second system partition to be the boot partition.