Garage door openers have different systems that open a garage door. A chain drive uses a chain as the mechanism to help open and close a garage door; a belt drive uses a belt mechanism; a screw drive a corkscrew rod; and a direct drive attached directly to the torsion bar to help open and close a garage door. Belt drive openers tend to be quieter than chain drive openers. Screw drive openers are known to require less adjustment over time. Direct drives take up less space in your garage.