A hardware technology designed to replace CardBus (also known as PCMCIA) standards for hot-pluggable internal I/O expansion for notebook and desktop computers. ExpressCard enables you to add memory, wired and wireless communications, multimedia and security features by inserting ExpressCard modules into compliant systems. There are two standard formats of ExpressCard modules, the ExpressCard/34 module (34mm x 75mm) and the ExpressCard/54 module (54mm x 75mm). Both formats are 5mm thick and use the same connector interface.
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