Troubleshooting Tape Drives in ntbackup

To completely uninstall a driver:

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Cannot delete 'Tape Drive': only 'Not present' libraries can be deleted

First make sure that the tape drive is not listed in Device Manager. Make sure you've enabled "Show hidden devices" as above.

If you still can't remove the library maybe the RSM database is corrupt.

To rebuild the database:

  1. Stop the "Removable Storage" service
  2. Rename files in %SystemRoot%\System32\NtmsData folder with a .old extension
  3. Restart the "Removable Storage" service 

More info: Problems with a Damaged Removable Storage Manager Database