ExpressCard was created by PCMCIA, designed specifically to fix all the limitations of the old PC card technology. The cards come in 2 formats 34 and 54. The vast majority of products should be of the 34 format. The slot is not backwards compatible with old PC cards.
While ExpressCard supports not only USB 2 but PCI Express with theoretical speeds of 2.5Gb/s/direction the closest to fibre channel that I’ve seen so far is a Gigabit Ethernet card.
Here’s some reading for you.
~Ian
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