Where to find your storage information

Open the Apple menu in the top-left corner of your screen and select About This Mac. Click the Storage tab. You will see a colored bar showing how much space you are using and how much remains free. The bar breaks down your storage by category — System, Apps, Photos, Documents, and Other — so you can see at a glance what is taking up the most room.

This is the fastest way to get a snapshot of your drive. The numbers update in real time, so if you have just deleted files, you may need to wait a few seconds for the display to refresh. The storage tab also shows your total capacity at the top — for example, 256GB or 512GB — so you can compare what you are using against what you have.

Key Takeaways

  • Your storage information appears in About This Mac under the Storage tab, showing total capacity and what is using space.
  • The colored bar breaks storage into categories like System, Apps, Photos, and Other, so you can identify what takes up the most room.
  • Photos and videos usually consume the most space on a MacBook Air, followed by applications and cached files in the Other category.
  • If you are running low on storage, you can delete unused apps, move photos to external drives, or empty the Trash to free up space when ready.

Understanding what each category means

System is the macOS operating system itself and the files it needs to run. You cannot delete this, and it typically takes 10 to 20 GB depending on which version of macOS you have installed. This number grows slightly with each system update.

Apps is every process you have installed — Safari, Mail, Microsoft Word, Adobe Creative Suite, and anything else you downloaded. Removing unused apps is one of the fastest ways to free up space. Photos includes your photo library and any videos you have stored in the Photos app. This is often the largest category on a MacBook Air because photos and videos take up far more space than documents or spreadsheets.

Documents covers files in your Documents folder, Downloads folder, Desktop, and other standard locations. Other is a catch-all for cache files, temporary files, browser history, and system logs. This category often grows over time as your Mac accumulates temporary data it no longer needs.

Getting a detailed breakdown of what is using space

The Storage tab in About This Mac shows categories, but not individual files. To see exactly which apps or folders are consuming the most space, use the Storage Management tool. Open About This Mac, go to the Storage tab, and click the Manage button.

Storage Management opens a window with several tabs. The Documents tab shows your largest files and folders in order, so you can see when ready if one folder — like Downloads or a video project — is hoarding space. The Applications tab lists every app you have installed with its size, sorted from largest to smallest. The Trash tab shows what is in your Trash and how much space it is using; emptying Trash frees that space when ready.

The Large and Old Files tab finds files you have not opened in months or years, which are often safe to delete. The Photo Library tab shows how much space your Photos app is using and offers options to optimize storage by storing full-resolution originals in iCloud instead of on your drive.

Why your storage might fill up faster than expected

MacBook Air drives fill up quickly because the machines come with smaller capacities than larger laptops — typically 256GB or 512GB. Photos and videos are the main culprit. A single 4K video can be 1 to 2 GB, and if you record video regularly or take many photos, your library can balloon to 50 GB or more without you realizing it.

The Other category also grows silently. Browser cache, process support files, old backups, and temporary files accumulate over months. If you have not restarted your Mac in weeks, temporary files can add up. Downloads folder is another hidden space-eater — many people read files and forget them there.

If you use iCloud Drive or Dropbox, those applications may be syncing large folders to your local drive as well. Check your cloud storage settings to see whether files are being stored locally or only in the cloud.

Freeing up space when your drive is nearly full

Start with the fastest wins. Empty your Trash by right-clicking the Trash icon in the Dock and selecting Empty Trash. This reclaims space when ready. Then go to your Downloads folder — open Finder, click Downloads in the sidebar, and delete files you no longer need. Most people accumulate gigabytes of old installers and documents here.

Next, review your Applications folder. Open Finder, click Applications in the sidebar, and look for apps you have not used in months. Drag unused apps to Trash. Be cautious with system apps like Mail or Calendar — removing those can cause problems. Stick to third-party apps you installed yourself.

If you have a large photo library, consider moving older photos to an external drive or enabling iCloud Photo Library to store originals in iCloud instead of locally. Go to System Settings, click your name at the top, select iCloud, then Photos, and turn on iCloud Photos. Your Mac will keep lower-resolution versions locally and store full-resolution files in iCloud.

For the Other category, restart your Mac. This clears temporary files and cache. If space is still tight, you can use a third-party tool like CleanMyMac or Disk Diag to identify and remove cache files safely, though this is rarely necessary for most users.

Monitoring storage over time

Check your storage every few months, especially if you work with large files like video or photography. A MacBook Air with 256GB can feel spacious at first but becomes cramped if you store years of photos or large project files locally. Knowing your usage patterns helps you decide whether to invest in an external drive or upgrade to a larger capacity machine when you next purchase.

If you regularly hit 85% capacity or higher, your Mac will slow down noticeably because it needs free space to create temporary files and run smoothly. Keeping at least 15% of your drive free — roughly 40 GB on a 256GB machine — keeps your Mac running at full speed.

Frequently Asked Questions

How much storage does macOS itself take up?

macOS typically uses 10 to 20 GB depending on the version. Newer versions like Sonoma use slightly more than older versions like Big Sur. This number is shown in the System category in your Storage tab and grows slightly with each system update.

Can I delete files from the Other category to free up space?

Most files in Other are temporary and safe to delete, but deleting them manually is tedious. Restarting your Mac clears many temporary files automatically. For deeper cleaning, third-party tools can remove cache safely, but for most users, deleting unused apps and old downloads is faster and safer.

What happens if my MacBook Air runs out of storage?

Your Mac will slow down significantly and may refuse to install updates or save files. You will see warnings when you reach 90% capacity. The best time to free up space is when you hit 80 to 85%, before performance suffers.

Should I move my photo library to an external drive?

If your photo library is larger than 50 GB and you have a 256GB MacBook Air, moving it to an external drive or enabling iCloud Photos is a good idea. External drives are inexpensive and keep your internal drive fast. iCloud Photos works well if you have a stable internet connection and a paid iCloud+ plan.

Why does my storage bar show full even though I deleted files?

Files you delete go to Trash, which still counts as used space. Empty your Trash to reclaim that space. Also, if you just deleted files, wait a few seconds for the Storage tab to refresh — it does not update when ready.