I put my micro sd card into my galaxy note cell phone to view the pictures I took with my Nikon D3200. Then, when I put my sd card back into the D3200, the camera says to format the sd card! How can I recover my images? I have not formatted the card because I might lose my pictures. What should I do?
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I also have gotten into the habit of saving images relatively often, rather than letting them sit on the card. Save first, edit second. Better to have multiple copies of junk than to lose the treasures.
If it's a micro SD card, make sure it's making good contact in the adapter too. Try unplugging and replugging it, and try it in multiple machines before giving up.
You will lose the pictures if you format. Do not format unless you are sure that the pictures are lost forever.
What measures you take to recover a corrupted card will depend a bit on how important the images are. There is software for this, and services that can sometimes help, but unless your images are irreplaceable, it's probably best to let them go.
Most likely what happened is that your Note probably added a few files or folders to your memory card. Android tends to do that when you mount a memory card, and then your camera refused to accept the memory card due to the addition of those files/folders.
(note: not advised - I just did it to find out what would happen)
However, format will erase all the photos and videos on your card.
You can use Yolisoft Photo Recovery to retrieve formatted files from your SD card.
https://www.yolisoft.com/photo-recovery.html
I tried to recover them but could not find them. However, in the process I found that most of the recovery programs, though they will scan for free, require you to pay to recover.
I found, however, an open source program called "testdisk" that includes a deep recovery program. I never found the files wanted, which had probably been overwritten, but found deleted images going back for years.
The program runs in Windows but drops into Dos and it's a bit tricky at first, but if you spend time with it, it appears that it can do some pretty serious recovery.
Check the guide: https://www.gihosoft.com/data-recovery/recover-deleted-photos-videos-from-sd-card.html