User's Manual

Using ExpressCards (Optional)
Depending on the model, your computer has an ExpressCard slot.
ExpressCard supports the PCI Express and USB 2.0 serial data interfaces
(supporting speeds of up to 2.5 Gbps and 480 Mbps respectively), improving
speed in data transfer while conserving power usage.
ExpressCard Type
The ExpressCard slot can accommodate a 54 mm (ExpressCard/54) or 34 mm
(ExpressCard/34) wide ExpressCard. Typical ExpressCards support a very
extensive range of applications including memory, wired and wireless
communication cards, and security devices.
Shown next are the appearances of ExpressCards for your reference.
ExpressCard/54 ExpressCard/34