A printing device and a control method for a printing device can freely change the distribution of print data to the front and back sides to achieve the desired duplex printing result when operating in a duplex printing page mode that converts the print data for one page after setting the data conversion area. The photosensor may have light sensors having indentation features including, but not limited to, v-shaped, u-shaped, or other shaped features. An inner edge of the frame layer is formed with an internal thread, and a transparent layer is fixed by the frame layer such that the photosensitive chip may receive optical signals passing through the transparent layer. The physical location may store data associated with the logical address of the backing store. The first connector receives and outputs a number of parallel signals from the first element.