Thanks for all the info everyone!
The one I am interested in is made by Verbatim who have been around for years. Sounds exactly like your Digimate Freezing. Runs on a battery also, along with a ac adapter.
It has 80gb of storage and from what I can see by the photo, you insert the card into it then it transfers everything from you card on to the mini 80gb hard drive. You can then format your card for a fresh go round. When I get back from holiday, I can then transfer everything from it to my computer via usb.
Be very carefull when you insert the CF card back into the camera.
I too have a D200 and had to change cards during a shoot. When I inserted the new card the camera coudn't recognise it.
The problem turned out that the card slot on the D200 is not a precise fit and if the many pins on the camera don't line up properly with the card then some will either get bent or as in my case 2 of them dissapeared into the body of the camera.
Nikon fixed it under warrenty but it took 4 weeks. I now have a 4Gb card which never comes out. If I think that I will run out of space I take my laptop with me and connect it with the cable.
Ann