My D-700 has had continued problems from purchase with CF card CHA error. I purchased the camera in 2009 from Adorama and sent the camera in to the Nikon El Suguendo service center to address the problem. The camera was checked and returned to me at no charge during the warranty period. The Service tech did a cleaning and basic service and sent along a list of approved cards with a note instructing me to format my CF cards with my PC. I took the camera down to my local dealer and we found a San Disk 8GB/15MB/S card that I have been using ever since. The not so funny thing is my old D 200 will run 16GB/30MB/S cards no problem. I have tried to upgrade firmware but still no luck. It seems that any card over 15MB/S is too much for my D 700 to handle. Just a little frustrating for such an expensive camera. The cards will not format as well in the camera. When I tried to update the firmware It took 3 attempts before the camera responded to the upgrade on the CF card, but as I stated earlier still no luck with the CHA problem. So my camera is now out of warranty and on its way back to The El Suguendo Nikon service center. Any one else out there have this problem or was I just the lucky one?