SIIG recently introduced an USB-to-ExpressCard adapter, which allows any USB 2.0 port on a computer to function as an ExpressCard slot. It runs on Windows Vista and Mac OS X 10.3+ but for any driver.
The only feasible trouble is that the adapter is just compatible with USB-capable ExpressCard devices; PCI-based ExpressCards won’t work. Yet, you are enabled to cram more ExpressCards than ever envisaged by you into your machine right now for more or less $32 per adapter.
The adapter also brags an utmost transfer rate of 480Mbps and gives support to hot swapping. Speaking on the contrary, if it is the card of USB2.0 connection, it is not required to stick to the Express34/54 card slot alone
