this sort of thing is an extention of the idea of putting eq on a card:
http://www.ebay.co.uk/itm/2013-PCI-t...-/360733359299
tbh when it comes to pricing, could be cheaper to buy a small sata3 ssd.
compact flash cards, especially the fast ones, are overpriced.
sadly above link doesnt actually give data transfer rates.....needs to be over 80mb/s, to be worth the effort.
more modern versions :
http://www.ebay.co.uk/itm/CF-Compact...-/360871075227
external version :
http://www.ebay.co.uk/itm/4-Port-USB...-/331043554065
pluging in via an adapter into usb3 slot, is in theory the fastest route.....in practise the adapters are the low quality bottleneck.