You don't have to erase-then-copy if you clear some space on the image that will allow the files to copy. The issue here is that you're likely running quite close to capacity on the source. So, when large folders of photos are moved/rearranged, you can end up with this kind of issue.
The Troubleshooting section of the User's Guide explains how Smart Update works and can help, too.
__________________
--Dave Nanian
|