SH is correct. That page isn't exactly clear, but if you check "Mac compability" in the sidebar, you'll see that it requires a 15" 17" MBP with an ExpressCard slot, or an MP with PCIe.
PCIe actually defines an external version of the standard, though - essentially, a special port - which might be able to do something like this. I've never seen a real product that makes use of it, however.