Solved: How to Fix "Insufficient Disk Space" on Mac

Recoverit Editorial Team

Oct 22, 2026 • Filed to: Solve Mac Problems • Proven solutions

⚡ Quick Answer: How to Fix "Insufficient Disk Space" on Mac?

Open Finder and delete unnecessary disk images (.dmg) and large files from Downloads, empty the Trash (including Mail, iMovie, and iPhoto trash), uninstall unused applications, and clear ~/Library/Caches temporary files. Then go to Apple Logo > About This Mac > Storage > Manage to enable Optimize Storage and review recommendations. If you accidentally deleted important files while cleaning, run Wondershare Recoverit for Mac to recover them.

While working on your Mac, are you getting an "insufficient disk space" error? It appears when the hard disk is left with a little or no space. You must be wondering how this affects Mac. Well, insufficient disk space Mac results in the slow and unstable performance of your operating system. It can even prevent any application from launching or work properly.

Are you also facing the same issue and thinking how to clean your disk properly? Here is a comprehensive guide for you. In this article, we will cover why you are getting an alert 'your disk is almost full' and how to fix it.

If you have accidentally deleted a necessary file, then you will also learn how to recover it with the Recoverit Data Recovery Software.

Part 1: What Causes Insufficient Disk Space on Mac?

There is no more space on your disk, and you might be wondering why? Well, hard disk space should never go beyond 85% because this will make the system slow and cause errors. If you get this warning, then it's a red flag that you need to free up the storage instantly.

Before identifying what is taking up more space on the disk, reach the hard drive with the below steps:

Step 1: Get the mouse on the Dock at the bottom of the screen and open 'Finder.'

Step 2: Click on it in the menu bar at the top of the screen and then choose "Preferences."

Step 3: In the pop-up window, check "Hard disks."

After performing this step, your system will now show the hard disks on Mac in the form of icons. If you see more than one hard disk icon on your desktop, that means you have got multiple disks on the Mac. For this, you need to perform the steps below:

Step 1: Click on the 'Apple icon' at the top left and then head to System Preferences and then Startup Disk.

Step 2: Again, you will find hard disks, and they are usually named like Main HD or Main SSD. It will also show the OS version. In case you have more than drive, your startup disk should be the one with the latest MAC version.

To confirm what drive is your startup disk, follow the steps below:

Step 1: Click the 'Apple' icon in the menu bar at the top-left of the screen.

Step 2: Choose "About This Mac."

Step 3: Under MAC OS, you will notice a version number. This number should match the number in the Startup Disk section.

Part 2: How to Solve Insufficient Disk Space on Mac?

Wondering how to solve "Startup disk full" or "your disk is almost full" error? Here are the best solutions that help you get rid of this problem.

Method 1: Delete Unnecessary Duplicate Files

One of the simple tricks to get rid of insufficient disk space error is to find and remove duplicate files littering on your computer. It is true if you have been using your system for a very long time.

Plenty of people prefer to eliminate junk files on Mac by hunting in their drive or main directory where they store their files. However, they skip the download section. It has a lot of unnecessary data, mainly the 'disk images.'

To clean up these junk files, follow the steps below:

Step 1: Head to "Finder" and then choose the "Download" folder.

Step 2: Type "disk image" into the search box of the pop-up window.

Step 3: Now pick "Disk Image" beneath the "Kinds header."

Step 4: Search results will show all the DMG files. Delete all of them to save space in your Mac.

Method 2: Uninstall Unused Applications

Unused installed applications are also taking up space. For uninstalling them:

Step 1: Open "Finder" and choose applications that are no longer in use.

Step 2: Drag and drop the icons to trash.

To see which apps are using more space:

Step 1: Open Finder and choose an application.

Step 2: Click icon 'show items in the list' on the toolbar and then click the size to sort them by size.

Method 3: Clean iTunes Backups

If you have massive iTunes data on your iPad, it might also be the reason behind insufficient space on Mac. To delete them manually, go to the path '~/Library/ApplicationSupport/MobileSync/Backup' to open backup folders.

Method 4: Empty Trash

Emptying trash on Mac will completely remove them and free up the disk space. However, Mac OS has multiple trash cans, so you may need to empty more than one.

To empty main trash of your user account:

Step 1: CTRL-Click or right click on the trash icon at the bottom right corner.

Step 2: Now, choose empty trash. It will delete all the files that you have moved to the trash from Finder.

Mail, iMovie, and iPhoto on Mac have their trash cans. If you have deleted files from them, you also need to empty their trash cans. To do this, simply:

Step 1: CTRL+click or right-click the 'Trash option' in that particular application

Step 2: Choose Empty Trash.

If you are unable to find deleted files on Mac trash, use the All-Round Recovery option. It will scan and hunt for more files from trash deeply. Relax and wait for the tool to recover all the data deleted from the trash folder.

Method 5: Remove Temporary Files

MAC temporary files sometimes take up huge disk space. Removing them will not only speed up your system but also free up disk space. There are tons of temporary files that you can check out by opening Finder and then go to Folder using ~/Library/Caches.

It will open a cache folder that consists of plenty of folders in it. You can choose and delete it manually as per your needs.

Method 6: Get Rid of Language Files

Mac applications bundle language files for every language, which can waste hundreds of megabytes of disk space for no reason.

1. Open Applications, right-click an app, and choose Show Package Contents, then open the Contents folder.
2. Click the Resources folder and delete the language files you don't need.
3. Repeat these steps for other applications that contain unneeded language packs.

Method 7: Clean your Downloads Folder

Usually, the download folder is full of big files that you do require. To delete all the data from downloads, perform the following steps:

Step 1: Simply open the Finder and go to the Downloads folder.

Step 2: Begin deleting data you don't need.

If you want, you can even sort the file size fast. However, don't skip to look at the folders. Remember, every time you open an archive file, it unzips into the folder automatically. And these folders are taking plenty of space on your Mac disk drive.

Method 8: Clean up Bulky Attachments in your Mail

Big Mac mail attachments are taking a lot of space on your drive. Thus, it's a good idea to clean them while checking your drive. You can uncheck 'download attachments automatically' or run a cleanup tool to get rid of them.

In case you are using Gmail, you can set limits on how many messages are synced by default over IMAP.

Step 1: Head to Mail > Preferences > Accounts > Account information

Step 2: Change 'Download attachments' to 'None' or 'Recent.'

Method 9: Delete Web Browser Cache

Internet browser creates cache every time you visit any website. However, doing this keeps your browser folder heavy, thereby creating a big problem. Thus, eliminating web browser junk is undoubtedly a priority. For this, perform the following steps:

Step 1: Open web browser and open 'history' tab

Step 2: Tap clear browsing data and choose files that you want to eliminate – cached images, cookies, site data

Step 3: Select from the top menu how far back you need to delete

Step 4: Click button named 'clear browsing data.'

How to Recover Accidentally Deleted Files with Recoverit for Mac

Wondershare Recoverit Mac Data Recovery recovers documents, archives, pictures, audio, emails, and more in just a few minutes.

• Recovers deleted, corrupted, and lost files on Mac in minutes.
• Supports more than 1000+ file types and data formats.
• Restores data from an emptied Trash.
• Repairs corrupted videos with ease.

1. Select a location: Launch Recoverit on Mac, pick a drive under the Desktop tab in the Select Location section — or choose Select Folder if you know where the files were — and click Start. Use the advanced scanning feature to recover large deleted, lost, or formatted files.

2. Preview and recover files: Preview the recoverable data first, pick the files you need, and hit the Recover button.

3. Save Mac files: Choose a different location on your drive to save all the recovered data.

Part 3: How to Ensure that Mac Have Enough Disk Space?

If you want to make your MAC run faster and ensure that it has sufficient disk space, use the following pointers.

4 Tips to Keep Your Mac from Running Out of Disk Space

1. Quit Heavy Applications Running in the Background

Mac apps drain your system even when you're not using them. Use the built-in Activity Monitor to quit them and free up resources, bandwidth, and battery life.

1. Go to Finder > Go > Utilities and open Activity Monitor.

2. Review network, CPU, disk activity, memory, and individual tasks, then quit the heaviest background apps.

2. Optimize Drive Storage

1. Go to Apple Logo > About This Mac > Storage.

2. Click the Manage button and follow the recommendations to save hard disk space automatically.

3. Check for Hardware Upgrades

Upgrading your drive or RAM is the best way to get maximum performance from an aging Mac.

1. Reset PRAM: Restart your Mac, press and hold Command + Option + P + R before the grey boot screen appears, and release the keys once the system restarts.
2. Identify your RAM type: Go to Apple Logo > About This Mac > Overview to check your RAM before a physical upgrade.

4. Get Rid of Clutter

1. Open Apple Logo > About This Mac > Storage > Manage and click Review Files.
2. Pick a file category in the sidebar — Trash, Music, Documents, Creation, or Applications — and delete the data files directly from this window.

Wrapping Up:

Macbook's hard drives fill up quickly. Luckily, there are simple methods to free up space on your hard drive and get rid of 'insufficient disk space on Mac' error. We have discussed various solutions with detailed steps in this article.

However, if you have accidentally deleted any of the important files use the Recoverit Mac Data Recovery tool. Its advanced recovery feature will dig a lot deeper into your system and recover files of any size.