Did you really just format that external disk? Recover its data on macOS with data recovery software.

Method 1
Using a data recovery application
Step 1:
Download and install the app then fire it up
Step 2:
Select the disk you want to scan for lost files
Step 3:
Select a new location for the files and let the app restore them

Best 3 data recovery software for Mac
Updated 20 August. 2019
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Method 2
Recover from data loss using your backups
Step 1:
Launch your backup and restore software
Step 2:
Determine if you have a backup of the data in question
Step 3:
Restore your data from the storage media
Method 3
Send your storage device out for physical data recovery
Step 1:
Pack up your machine and drive to a recovery center
Step 2:
Find something to do while the data is being recovered
Step 3:
Get the bad news that physical recovery has failed