Form Factors
The ExpressCard standard specifies two form factors, ExpressCard/34 (34 mm wide) and ExpressCard/54 (54 mm wide, in an L-shape)—the connector is the same on both (34 mm wide). Standard cards are 75 mm long (10.6 mm shorter than CardBus) and 5 mm thick, but may be thicker on sections that extend outside the standard form for Antennas, sockets, etc.
The 34 mm slot accepts only 34 mm cards. The 54 mm slot accepts both 34 mm and 54 mm cards. A diagonal guide in the rear of the 54 mm slot guides 34 mm cards to the connector. Adapters are available for connecting an ExpressCard/34 card to a CardBus (but not 16-bit PC Card) slot.
Read more about this topic: ExpressCard
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