You can try to plug your External Hard drive on a different Port or you can plug it into another PC. Sometimes this solution work:
- Connect your external hard drive to another PC
- Click on My computer and check whether you are able to access it or not
If it displays your data you can immediately copy your files.
If you are still getting the same error message then you can follow the below solution to fix this hard drive not formatted error:
You can make use of Digital Media Recovery Tool that should detect your hard drive and then you scan your drive. Once the scan is completed, you can only recover media files such as photo, video and audio files from your external hard drive.