ExpressCards come in two sizes: 34 and 54. The 34 is the thinner one (34mm width).
ExpressCards come in two sizes: 34 and 54. The 34 is the wider one (54mm width).
PCMCIA (Personal Computer Memory Card International Association) is an international standards body and trade association with over 100 member companies that was founded in 1989 to establish standards for Integrated Circuit cards and to promote interchangeability among mobile computers where ruggedness, low power, and small size were critical. These are the guys behind the ExpressCard standard.
Universal Serial Bus (USB) is a standard for connection between computers and peripherals. ExpressCard modules use either the USB or the PCI-Express Buses to the host computer.
PCI ExpressPCI Express architecture is an industry standard high-performance, general-purpose serial I/O interconnect designed for use in enterprise, desktop, mobile, communications and embedded platforms.. ExpressCard modules use either the USB or the PCI-Express Buses to the host computer.