How to Scan Duplicate Files on External Hard Drives using Cleaner One Pro for Mac

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Click Drag folder to be scanned.
Select the drive to be scanned, then click Ok.
If your external drives do not appear, go to Finder and then select Preferences.
Navigate to Sidebar and ensure External Drives is selected.
Return to Cleaner One Pro and repeat steps 1 and 2.
You can now start scanning for duplicate files and add other drives or folders.

Keywords: Scan Duplicate Files, External Hard Drives

LAST UPDATED: MAR 03, 2026

Click Drag folder to be scanned.
Select the drive to be scanned, then click Ok.
If your external drives do not appear, go to Finder and then select Preferences.
Navigate to Sidebar and ensure External Drives is selected.
Return to Cleaner One Pro and repeat steps 1 and 2.
You can now start scanning for duplicate files and add other drives or folders.

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