---
id: freeing-space.what-does-unreadable-mean
url: https://storagestudio.us/faq/freeing-space/what-does-unreadable-mean
category: "Freeing up space"
subcategory: "What's Using Space (Storage Inspector)"
question: "Why does What's Using Space mark a folder as unreadable?"
alt_questions:
  - "Folder marked unreadable Storage Studio"
  - "Why can't Storage Studio read this folder?"
  - "Unreadable folder shows no size"
  - "Does unreadable mean empty?"
  - "Full Disk Access unreadable folder"
short_answer: "macOS won't let Storage Studio read that folder, so its size can't be measured. It's labelled unreadable instead of being counted as empty; granting Full Disk Access usually fixes it."
tags: ["unreadable", "full disk access", "whats using space"]
related: ["https://storagestudio.us/faq/freeing-space/what-does-the-coverage-footer-mean", "https://storagestudio.us/faq/freeing-space/how-do-i-find-the-biggest-folders"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# Why does What's Using Space mark a folder as unreadable?

It means macOS won't let Storage Studio look inside that folder, so its size can't be measured. Storage Studio labels it unreadable rather than silently counting it as empty, so you aren't misled about where your space is.

The most common fix is to make sure Storage Studio has **Full Disk Access** in System Settings → Privacy & Security; without it, many personal folders are off-limits. Some areas are closed to every app regardless, and the footer notes that too.

See the [Getting started FAQ](https://storagestudio.us/faq/getting-started/) for granting Full Disk Access.