Hi there, you can try using iBoysoft Data Recovery Software to restore the files on the external hard drive. iBoysoft Data Recovery Software is a wonderful data recovery utility that is designed with advanced disk scanning skills and data recovery algorithms.
Step 1: Free download and install iBoysoft Data Recovery Software on your device.
Step 2: Connect your external hard drive to your computer and launch the data recovery utility.
Step 3: Select your hard drive in the main menu of the utility and then click Search for Lost Data.
Step 4: Click Preview to check your files after the disk scanning process ends.
Step 5: Click Recover to begin the recovery process and save the results properly.