Fix “Disk Almost Full” on Mac: Free Up Storage Space Fast

June 21, 2025

Seeing the dreaded “Your disk is almost full” alert on your Mac? This common issue can slow down your computer and make it harder to run essential apps smoothly. Fortunately, solving this problem is easier than you might think.

In this guide, we’ll walk you through simple, effective ways to free up space on your Mac, boost its performance, and prevent future storage headaches.

Why Your Mac Shows This Warning

When storage hits 90% capacity, macOS warns you because:

• ⚠️ System slowdowns occur as swap files struggle
• ⚠️ Updates fail (macOS, security patches, apps)
• ⚠️ Critical features like Time Machine stop working

Pro Tip: Keep 15-20% free space for optimal performance.

Step 1: Analyze Storage Usage

Click Apple logo () > About This Mac > Storage

Review the color-coded breakdown:

Documents (purple): Largest space hogs

Apps (blue): Unused software

System Data (grey): Cache/junk files

Other (yellow): Miscellaneous files

Step 2: Use Mac’s Built-in Storage Management

From the same ‘Storage’ tab, click ‘Manage’.

In the new window, explore tabs like:

Large Files: Shows the biggest files on your Mac.

Downloads: Find old files you might no longer need.

Unsupported Apps: Remove apps that no longer work.

File Browser: Manually navigate your folders and spot large items.

If you find files you no longer need, select them, right-click, and choose ‘Delete’. This removes them instantly without sending them to Trash.

Step 3: Manually Clear Unused Files via Finder

For deeper cleanup:

Open Finder > Preferences.

Under the ‘Sidebar’ tab, make sure your Mac hard disk is checked to appear under ‘Locations’.

Go to Finder > Command + F to search by file size:

Change the search parameter to ‘File Size’.

Sort to find the biggest files quickly.

Right-click on unnecessary files and choose ‘Move to Trash’.

Don’t forget to Empty Trash to permanently free up the space.

Step 4: Clear System Cache Files

System caches can quietly build up over time, taking gigabytes of space.

In Finder, click ‘Go’ > hold Option (Alt) key > select ‘Library’.

Open the ‘Caches’ folder.

Press Command + A to select everything.

Right-click > Move to Trash.

Empty the Trash to finalize the cleanup.

Pro Tip: Clean your caches at least once a month for optimal system performance.

Final Tips to Keep Your Mac Storage Healthy

You’ll be given options to back up your recovery key:

✔️ Regularly empty Downloads and Trash

✔️ Uninstall unused apps

✔️ Use cloud storage (iCloud, Google Drive)

✔️ Backup large files to an external drive

Conclusion

Clearing out storage on your Mac isn’t complicated—it’s just about knowing where to look. By following these simple steps, you’ll not only reclaim precious disk space but also improve your Mac’s overall performance.

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