What is an expresscard/54 slot for?
PC Cards come in three types: Type I cards (3.3mm thick) are mainly used to add memory, Type II cards (5mm thick) are generally used for network adapters, and Type III cards (10.5mm thick) are often used for hard drives. ExpressCard is the next generation of the PC Card. The numbers indicate the card’s width: ExpressCard/34 devices are 34mm wide; ExpressCard/54 cards are 54mm wide. Aside from being smaller than existing PC Cards, ExpressCards promise data-transfer rates that are twice as fast. That faster speed means the cards can be used for high-bandwidth interfaces, such as Gigabit Ethernet ports and HDTV tuners.
