Did you really just format that external disk? Recover its data on macOS with data recovery software.
Method 1
Employing a data recovery software tool
Step 1:
Download the software, install it, and launch the app
Step 2:
Select a disk to scan for deleted data
Step 3:
Select the files to be recover and a location at which to store them
Best 3 data recovery software for Mac
Updated 07 December. 2019
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Method 2
Recover deleted data from previoulsy made backups
Step 1:
Launch the applicaiton that you used to create the backups
Step 2:
Search the backup catalog for the desired files
Step 3:
Restore your data from the storage media
Method 3
Employ a professional physical data recovery service
Step 1:
Bring your machine to a reputable recovery service
Step 2:
Get used to life without your computer for a few days
Step 3:
Pay the man and get your computer and its data back