Like a PCI slot in a desktop, an ExpressCard slot provides expansion opportunities. Additional USB, FireWire, SATA and ethernet ports, sound cards, wireless cards and TV tuners are all available in ExpressCard format. It comes in two sizes -- 54 and 34, representing how many millimetres wide they are. Both sizes end in a 34mm connection, with the 54mm end of the bigger card used to store extra circuitry. As such, an ExpressCard 34 will fit in a 54 slot, but not vice versa.
Business laptops are still using the older PC Card (or PCMCIA) instead of ExpressCard, and there are still more peripherals available through PC Card than ExpressCard. PC Cards and slots come in three sizes: Type I, II, and III. Type I cards are normally used for memory, Type II for input/output devices, and Type III for mass storage and firewalls.
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