In which of the following sizes are the Express Card modules available?
Each correct answer represents a complete solution. Choose two.

A.
54 mm Wide

B.
64 mm Wide

C.
20 mm Wide

D.
34 mm Wide

Explanation:

Express Card is a thinner, faster, and lighter modular expansion for desktops and laptops. Users can
add memory, wired or wireless communication cards, and security devices by inserting these
modules into their computers.
Express Card slots are designed to accommodate modules that use either Universal Serial Bus (USB)
2.0 or the PCI Express standard. Express Card modules are available in two sizes, i.e., 34 mm wide
(Express Card/34) and 54 mm wide (Express Card/54). Both modules are 75 mm long and 5 mm high.
An Express Card/34 module can be inserted in either a 54 mm slot or a 34 mm slot, but an Express
Card/54 requires a Universal (54 mm) slot. However, an extender can be used with Express Card/34
slot to connect the Express Card/54 module from outside of the computer.
Both the modules are identical in performance. They take full advantage of the features of the PCI
Express or USB 2.0 interfaces. The only difference between them is that the Express Card/54 formor, due to its larger surface area, allows for greater thermal dissipation than does an Express
Card/34. As the performance does not vary with module size, module developers usually prefer to fit
their applications into the smaller Express Card/34 form or. But some applications, such as
SmartCard readers, and CompactFlash readers, require the extra width of an Express Card/54
module.
Reference. “http.//en.wikipedia.org/wiki/Express Card”