An imaging device is provided with an internal memory and a controller. The internal memory includes a first area configured to hold device information about the imaging device and a second area configured to hold other information which can include demo data. At least one of the areas within the first area is capable of being defective. The controller is coupled to the internal memory to operate the internal memory to hold and move updated device information within the first area and/or within the second area according to the size of the non-defective areas within the first area.