Definition of 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2003 by the Personal Computer Memory Card International Association (PCMCIA), the ExpressCard was a plug-in module that superseded the PC Card standard for adding functionality to laptops.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 supported USB 2.0 and single lane PCI Express simultaneously (see USB and PCI Express).

Smaller than PC Cards

ExpressCards were 11mm shorter than PC Cards and came in two widths: 54mm and 34mm. ExpressCard 54mm slots accommodated both sizes.

An Almost-Internal USB Solution

The ExpressCard eliminated the need to carry an external USB storage device and cable. For example, a hard drive or flash drive could remain within the laptop when traveling, with only a small protrusion jutting out from the side. See PC Card.

ExpressCards

Two ExpressCard Sizes