A plurality of transactions are executed in a data storage application. The support member is drivable in a conveying direction. The condition detection component then selectively receives events related to the condition of interest from a data collection component. The first projection unit is used for projecting a first image beam on the side surface of the reflective element, and the side surface of the reflective element reflects the first image beam to allow the first image beam to fall upon the full-surround screen.