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The SD card may be defective,
If you are using a SD card to record your videos, please remove the card and connect it to a USB Card reader, then connect that card reader to your computer's USB port and see if your files are there. That way you can recover your videos.If you don't have a SD card reader, you can buy it from here (they are very cheap) ===> USB SD card reader
Then let me know if you could retrieve your videos.
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