There are a number of free/shareware utilities that can analyze/repair/restore data drives - below are a few. Some only allow so much data to be restored with the ‘free’ version. Just make sure that when you restore data - initially at least, that you restore to a DIFFERENT DRIVE - so as not to over-write the missing data on your problem drive.
Good luck.
https://www.partitionwizard.com/free-partition-manager.html
https://www.easeus.com/datarecoverywizard/free-data-recovery-software.htm
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