Can't Repair or Mount External Hard Drive on Mac

General
1

My MacBook Pro can no longer access a very important drive of mine. When I repair it in First Aid, it says “First process has failed. If possible, back up the data on this volume.” When I click the Mount button in Disk Utility to mount it, it says " Could not mount “disk2s2”. (com.apple.DiskManagement.disenter error -119930868.)."

How to access this external drive on Mac?

2

There are two possibilities. First, your external drive has hardware issues. Second, your external drive is corrupted.

3

Consider recovering your files with iBoysoft Data Recovery for Mac and reformatting the drive.