macOS Storage Full

Common storage symptoms

• “Your disk is almost full” warnings.
• Mac won’t install updates due to low space.
• System Data appears extremely large.
• Storage doesn’t change after deleting files.
• Apps crash or freeze due to lack of free space.

Step 1 – Check your storage breakdown

See what’s using the most space.

1. Open System Settings.
2. Go to General → Storage.
3. Review categories like Apps, Documents, Photos, and System Data.

Step 2 – Remove large files

Large videos, downloads, and installers often take the most space.

1. Open Finder.
2. Press Command + F to search.
3. Filter by File Size → is greater than → 1 GB.
4. Delete files you no longer need.

Step 3 – Empty the Trash

Files remain on your disk until the Trash is emptied.

1. Right‑click the Trash icon.
2. Select Empty Trash.

Step 4 – Clean the Downloads folder

Installers, ZIP files, and old documents often pile up here.

1. Open Finder → Downloads.
2. Sort by Size or Date.
3. Delete anything you no longer need.

Step 5 – Manage Photos and Videos

Photos and videos can consume huge amounts of space.

• Open Photos → delete unwanted media.
• Empty the Recently Deleted album.
• Enable Optimize Mac Storage if using iCloud Photos.

Step 6 – Remove large Messages attachments

Videos and photos in Messages take space.

1. Open Messages.
2. Go to Settings → General.
3. Set Keep Messages to 1 year or 30 days.

Step 7 – Clean up Mail storage

Mail attachments and cached files can grow large.

• Open Mail.
• Go to Mailbox → Rebuild to clear cache.
• Delete old emails with large attachments.

Step 8 – Delete unused apps

Some apps store gigabytes of data.

1. Open Finder → Applications.
2. Sort by Size.
3. Delete apps you no longer use.

Step 9 – Reduce System Data

System Data includes caches, logs, and temporary files.

• Restart your Mac — this clears temporary caches.
• Clear browser caches (Safari, Chrome, Firefox).
• Delete old iOS backups in Finder → Locations → iPhone.

Step 10 – Run Disk Utility First Aid

Fixes storage index errors and corrupted file structures.

1. Restart into Recovery Mode.
2. Open Disk Utility.
3. Select your startup disk.
4. Run First Aid.

Step 11 – Reinstall macOS (non‑destructive)

Fixes incorrect storage reporting and corrupted system files.

1. Restart into Recovery Mode.
2. Select Reinstall macOS.
3. Follow the on‑screen steps.

Step 12 – Erase the disk (last resort)

Only do this if the disk is severely corrupted or macOS cannot repair storage.

1. Backup your data first.
2. Erase the disk in Recovery Mode.
3. Reinstall macOS.
4. Restore from Time Machine if available.

When it might be hardware

• Storage errors appear frequently.
• Mac freezes when writing files.
• SSD is failing or extremely slow.
• Disk Utility reports unrepairable errors.