Hi Kirk,
Ahh, so that's how it keeps track. Unfortunately both cards in my 1DX have already been formatted. Stranger yet I ran a test this morning, took 2 shots, ingested, closed out PM. Card back into 1DX, took two more shots, verified the .dat file was still present (it was), ingested again and no duplicate 'A' files were created. So, what ever I was doing must have somehow messed this up but running the process as I described the dupes do not happen. Really hate when I do things like this but the good news, it's now working like it should. Only thing I can think of is that during the half time process, I was using the copy/move function inside of PM to place selected tagged photos to a sub-folder on the laptop. Could that have caused it?
Matt