@nafraf:
I think you have probably answered my question. So, before I try that (unlock switch on the card) which files should I delete and which ones should I leave alone?
My goal is to delete all jpegs and raw pics; Also, if I do that, will any exif data, or other files/data which pertain to my deleted pics be removed too? I don't see any need to retain all the extra data related to the photos which I want to delete, since that data is now saved on my PC, via my Shotwell program.
tia, Leo