---
id: external-drives.how-big-should-my-external-drive-be
url: https://storagestudio.us/faq/external-drives/how-big-should-my-external-drive-be
category: "External drives"
subcategory: "Choosing a drive"
question: "How big should my external drive be?"
alt_questions:
  - "What size SSD do I need for Storage Studio?"
  - "How much space should the fast drive have?"
  - "Is a 500GB external drive enough?"
  - "external drive capacity for offloading mac"
  - "How large a drive should I buy to move my apps?"
  - "What capacity external SSD should I get?"
short_answer: "Pick a drive comfortably larger than what you plan to move — check What's Using Space and the Apps window for the biggest items — and leave headroom, because moved folders keep growing on the drive."
tags: ["capacity", "external drive", "buying"]
related: ["https://storagestudio.us/faq/external-drives/what-kind-of-external-drive-should-i-use-with-storage-studio", "https://storagestudio.us/faq/external-drives/can-i-use-a-spinning-hard-drive-as-my-fast-drive", "https://storagestudio.us/faq/external-drives/can-i-use-the-same-drive-with-two-macs"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# How big should my external drive be?

Big enough for everything you plan to move, with room to spare. A good rule is to look at what you'd move first — open **What's Using Space** and the **Apps** window to see the largest folders and apps — and pick a drive comfortably larger than that total, so it doesn't fill up as those folders keep growing.

Some things to factor in:

- Folders you move keep growing on the drive (photo libraries, project folders, downloads).
- If you later upgrade with **Transfer Drive**, the new drive needs room for everything on the current one.
- Restore Points and removed files waiting in the Recycle Vault also live on the drive, though they're small or temporary.

Storage Studio doesn't need a minimum size of its own; the only hard limit is that whatever you move must fit.