It just simply marked as free so that another file can come and use those blocks. When you delete a file or a photo the operation system just removes the reference to that data, but doesn’t delete the actual files on your memory. It takes just three simple steps to prepare your iOS device for selling or just securely overwrite the free space using patented security standards, making it impossible to recover any deleted data.
You might think you've deleted those photos and videos on your devices but anyone can restore those manually deleted files from the free space on your device until the free space itself has been overwritten using secure deletion algorithms.
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