---
id: duplicates.does-it-check-my-external-drive-for-duplicates
url: https://storagestudio.us/faq/duplicates/does-it-check-my-external-drive-for-duplicates
category: "Duplicate files"
subcategory: "Where it looks and what it skips"
question: "Does the duplicate finder check my external drive?"
alt_questions:
  - "Can Storage Studio find duplicates on an external SSD?"
  - "Find duplicate files on external hard drive mac"
  - "Does Duplicates scan USB drives?"
  - "Duplicates between my Mac and my external drive"
  - "Will it find copies I've already moved to my drive?"
short_answer: "No. The duplicate finder checks Downloads, Documents, Desktop, Movies and Pictures on your Mac, plus iCloud Drive and connected cloud accounts. External drives aren't scanned, and folders Storage Studio has moved to your drive are left out."
tags: ["duplicates", "external drive"]
related: ["https://storagestudio.us/faq/duplicates/which-folders-does-the-duplicate-finder-check-on-my-mac", "https://storagestudio.us/faq/duplicates/are-duplicates-compared-across-different-sources"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# Does the duplicate finder check my external drive?

No. The **This Mac** source checks folders in your home folder — Downloads, Documents, Desktop, Movies and Pictures — and external drives aren't scanned. Folders Storage Studio has moved to your drive for you are also left out, because it manages those itself.

The sources are also checked one at a time, so a file on your Mac and a copy of it somewhere else (another drive, or a cloud account) aren't compared against each other.

If your goal is to free space on your Mac rather than on the drive, moving big folders is often the bigger win — see [moving folders](https://storagestudio.us/faq/moving-folders/).