I have a Sandisk UltraPlus 16GB card—used in a Canon Powershot SX30IS—on which nearly every frame has been erased…I don't know how. I do not format. I use the card as storage. I use a card till it's full, then insert a new card. I do not erase images either. This just leaves a messy black blank amidst filled frames. I do not use a computer to view images. My Asus erases a frame if I click reverse. I view images through the screen on the camera. I print paper pictures at Walgreen's on their digital-to-print machines.
I know what used to be on the subject card. I reviewed and made notes. I have printed some of the images. But when I wanted to print the remaining frames, nearly everything had been erased. The frames remaining are interrupted by erased frames, though they were made on the same two consecutive days.
I can't figure out how they were erased. I seldom go to menu except to correct the date when I change time zones. My thick fingers often mis-hit buttons on the camera, but none of them should cause erasing. I've tried to recover with the camera club's WIN Recovery software, with no luck. What happened and what do I do to retrieve the erased frames? (I'm emailing SanDisk, but their tech either knows nothing or is hiding something.)