"When I dump a flash card to the computer (using Aperture), I then remove the card, and delete it manually on the camera." A safer way would be to keep at leas

"When I dump a flash card to the computer (using Aperture), I then remove the card, and delete it manually on the camera." A safer way would be to keep at least two copies of your photos at all times. I delete mine from the card only after they are on my hard drive and backed up on an external drive.