Moving maps to SD Card

I just got a 700i and am trying to move the the North American NT maps to my SD Card, I use Garmin express to do this, it takes anywhere from 2 hours to 30 minutes for the process to complete, the problem is when I re connect the Garmin the maps are still on the internal memory. I have tried to do this 4 times and get the same result every time. I even tried a different SD card and I cant move any of the maps to it. Anyone else have this issue? I am able to move Birdseye imagery to the SD card.

Thanks