A CDE Definition
A plug-in ExpressCard that is 34mm wide. See ExpressCard.
The third-generation expansion interface from the USB Implementers Forum (www.usb.org). Introduced in 2003 by the Personal Computer Memory Card International Association (PCMCIA), the ExpressCard is a plug-in module that superseded the PC Card standard for adding functionality to laptops. ExpressCard boosted the data rate from 132 to 342 Mbytes/sec. It supports USB 2.0 and single lane PCI Express and can use both of these channels in the same module at the same time (see USB and PCI Express).
Smaller than PC Cards
ExpressCards are 11mm shorter than PC Cards and come in two widths: 54mm and 34mm. ExpressCard 54mm slots accommodate both sizes.
An Internal USB Solution
The ExpressCard eliminates the need to carry an external USB storage device and cable. For example, a USB hard drive or flash drive can remain within the laptop when traveling, with, at most, a small protrusion jutting out from the side. See PC Card.
Two ExpressCard Sizes
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