The ExpressCard standard specifies two form factors, ExpressCard/34 (34 millimetres (1.3 in) wide) and ExpressCard/54 (54 mm (2.1 in) wide, in an L-shape)—the connector is the same on both (34 mm wide).
Norma ExpressCard specifikuje dvě formy, ExpressCard/34 (34 mm) a ExpressCard/54 (54 mm, ve tvaru písmene L) -konektor, který je stejný na obou (34 mm).