---
id: mac-storage-basics.what-does-your-disk-is-almost-full-mean
url: https://storagestudio.us/faq/mac-storage-basics/what-does-your-disk-is-almost-full-mean
category: "Mac storage basics"
subcategory: "When the disk is full"
question: "What should I do when my Mac says \"Your disk is almost full\"?"
alt_questions:
  - "your startup disk is almost full"
  - "mac disk almost full warning"
  - "startup disk full what to do"
  - "save space by optimising storage message"
  - "disk full notification mac"
short_answer: "Your startup disk is nearly full. Empty the Trash, clear big downloads and old backups, release snapshots, and move big folders or apps to an external drive."
tags: ["startup disk full", "warning", "free space"]
related: ["https://storagestudio.us/faq/mac-storage-basics/what-happens-when-a-mac-runs-out-of-disk-space", "https://storagestudio.us/faq/mac-storage-basics/how-much-free-space-should-i-keep-on-a-mac"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# What should I do when my Mac says "Your disk is almost full"?

It means your startup disk is close to running out of room. Act soon, because a full disk causes failed saves, crashes and failed updates.

Quick wins, roughly in order:

1. Empty the Trash and Photos' Recently Deleted album.
2. Delete installers, disk images and other big files in Downloads.
3. Remove old iPhone backups and unused large apps.
4. Release local snapshots if you've recently deleted a lot.
5. Move big folders, libraries or apps to an external drive.

Storage Studio's **Emergency Space** screen picks the smallest, safest set of actions to reach the amount you need and never deletes anything without asking. See [freeing up space](https://storagestudio.us/faq/freeing-space/).