<p>I just got a 64 GB UDMA7 300X Lexar CF card to work on my Nikon D200 by downsizing it.<br>
Out of the package after plugging it into my D200 I got a "FOR" message. Formatting the card renamed the drive and added a DCIM folder, but showed a 0 frames remaining count (FULL). So it wasn't a whole lot of good to me at that point.<br>
I really couldn't find any useful information on the net after many searches and ended up using trial and error to get this card to work.<br>
I used a partition tool ("MiniTool Partition Wizard Free") to resize the partition to ~32 GB (actually I used 32757.51 MB or 31.99 GB), and then formatted the card in FAT32 (NOT exFAT of NTFS) with a cluster size of 64 kB (Default or 32 kB seem to work too).<br>
I wasn't able to get it to work for >31.99 GB. But I now have a card that takes about 2000 images... which is more than enough for my needs.<br>
I know this is a very old thread, but at least this provides better guidance than comments like "Nikon says the max card size is 2 GB so you're out of luck"</p>