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I have a Nikon Coolpix L20, and along with it, a PNY Optima SDHC 4GB SD card. I was at a concert so I took quite a few pictures. I came home, imported them, then deleted them off my SD card and put it in my camera. It said I could only take 15 pictures before it was full. I went to look on the computer and it said it had 38 MB remaining when I had nothing on it! I had to take a picture so I did so and went and imported and deleted it off the SD card.
Today, I looked at it and it said I could only take 8 pictures. I took 8 pics to experiment, then went on my computer again.
With the 8 pics, it said I had 5 MB remaining. I deleted the pics and it still said I had 5 MB remaining. I deleted all files and folders and it STILL said 5 MB remaining. It's a 4 GB card!
What happened? I'm on a Mac so for any instructions I need those instructions. Also, yes, I always eject it properly. Most people are unaware that each camera maker uses a different file structure for memory card use in their cameras. That's why each maker stresses formating your memory card in their camera at least the first time you use it. If you don't, the card may work temporarily, but with time will corrupt as you've discovered. But this problem is easily corrected.
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You need to format the card IN YOUR CAMERA using your camera's format feature (look for it in the menus, or dig out the camera's instruction manual). Note that this will also erase the card, but it should prevent this from happening again in the future.
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Also, whenever you consider erasing your card in the future, use format instead to keep the card rejuvenated.