What do these ExpressCard numbers mean?

Your new laptop computer allows for both ExpressCard/34 and ExpressCard/54 interfaces. To what do the /34 and /54 numbers refer?

A) The version number of the adapter cards

B) The adapter throughput in megabytes

C) The card voltage requirements

D) The width of the cards in millimeters

E) The amount of caffeine in grams

The answer: D) The width of the cards in millimeters

It’s easy to pick out an ExpressCard/34 or ExpressCard/54 adapter because of the obvious card width. Many laptops only support ExpressCard/34, while others can allow for both ExpressCard/34 and ExpressCard/54 adapters.

Want to know more? Watch “Bus Architectures and Expansion Slots.” An important consideration of the very first IBM personal computer was including standardized expansion slots so the end-user could customize their system. In this video, you’ll learn about bus architectures and expansion slots, including PCI, PCI Express, AGP, and CardBus.