An image forming apparatus of the present invention includes an intermediate image transfer belt to which a toner image is to be transferred from an image carrier, an image transferring device for transferring the toner image from the intermediate image transfer belt to a sheet, and a fixing device for fixing the toner image on the sheet. Where the edges of two servo bursts are used to define a position on the media, trimming the first burst and writing the second burst on separate revolutions will result in a different amount of position error being written into each burst. The core cell includes a threshold changing material. The sprite capture component enables capture of a sprite in video memory for use as another sprite. The output may include the test signal exhibiting the selected bit-error rate. By using the control sheet, stopper and resilient spring, the state of opening a door is determined or the door is set as an auto-close state.