So, your Mac is running out of storage. You try to figure out what’s taking up your disk space by clicking the Apple logo on the top-left of the screen, selecting About This Mac, and hitting the Storage tab.
To your surprise, you see a yellow bar representing “System” that seems to occupy way more space than you think it should. In the example above, it only shows 207 GB, but take a look at this Apple discussion — some Mac users report that System Storage takes an astonishing 250 GB.
Worse yet, you have no idea what’s included in “System” storage, because clicking the “Manage” button brings you to this System Information window… and the “System” row is greyed out.
Why does my Mac system require so much space?
What does it contain?
Is it safe to remove some of those system files?
How do I regain more storage space?
Questions like these may easily get to your head. Although my Mac now has a good amount of disk space available, I’m always wary of files that are taking up more space than they should.
I have no idea why “System” is greyed out while “Documents,” “System Junk,” “Trash,” etc. allow you to review the files based on size and type. My hunch is that Apple does this on purpose to prevent users from deleting system files that could lead to serious issues.
What Files Are Included in System Storage on Mac?
During my research, I found many people report that Apple counts iTunes backup files and app caches (e.g. Adobe video cache files) in the System category.
Since it’s greyed out and we are unable to click on that category for deeper analysis, we’ll have to use a third-party app to assist.
CleanMyMac X is perfect for this kind of analysis. Since I tested the app in our best Mac cleaner review, it immediately came to my head when I saw “System” was greyed out in Storage. Note that CleanMyMac isn’t freeware, but the new “Space Lens” feature is free to use and it allows you to scan your Macintosh HD, and then show you an in-depth overview of what’s taking up disk space on your Mac.
Step 1: Download CleanMyMac and install the app on your Mac. Open it, under “Space Lens” module, first click the yellow “Grant Access” button to allow the app to access your Mac files and then select “Scan” to get started.
Step 2: Soon it’ll show you a folder/file tree and you can hover your cursor over each block (i.e. a folder). There you can find more details. In this case, I clicked “System” folder to continue.
Step 3: The file breakdown below indicates that some Library and iOS Support files are the culprits.
The interesting part is that the System file size shown in CleanMyMac is much smaller than the size shown in System Information. This puzzles me and makes me believe that Apple definitely has counted some other files (not real system files) in the System category.
What are they? I have no clue, honestly. But as reported by other Mac users who experienced the same issue, they said Apple also considers app caches and iTunes backup files as System files.
Out of curiosity, I ran CleanMyMac again for a quick scan. That app found 13.92 GB in iTunes Junk. Further review revealed that the junk files are old iOS device backups, software updates, broken downloads, etc.
But even after adding this amount to the original system files returned by CleanMyMac X, the total size is still a bit less than what’s returned in System Information.
If cleaning the System Storage is still not enough to bring your Mac available disk space to a normal level (i.e. 20% or more), see below.
What Else Can I Do to Reclaim More Disk Space?
There are tons of ways out there. Here are a few of my favorites that should help you get back a decent amount of space quickly.
1. Sort all files by size and delete old large files.
Open Finder, go to Recents and look at the Size column. Click on it to sort all recent files by file size (from large to small). You’ll have a clear overview of what items are eating up a large amount of space, e.g. From 1 GB to 10 GB, and from 100 MB to 1 GB.
On my MacBook Pro, I found a few large videos that could be transferred to an external drive.
Note: If the Size column doesn’t show up, click on the Settings icon and select Arrange By > Size.
2. Remove duplicate files.
Don’t forget those duplicates and similar files! They can stack up without you being aware of it. Finding them is sometimes time-consuming. That’s what Gemini 2 is designed for. Simply select a few frequently used folders (e.g. Documents, Downloads, etc.) in the main zone of Gemini.
It then scans them and returns all the duplicate files that might be worth removing. Of course, it’s always a good practice to review them before doing so. You can also read more from our detailed Gemini review here.
Wrapping It Up
Ever since Apple introduced the Optimized Storage feature, Mac users got the option of saving space by storing content in the cloud. Apple also has several new tools that make it easy to find and remove unneeded files.
That bar under the Storage tab is beautiful. It does allow you to get a quick overview of what’s taking up the most space on our hard drive. However, it still lacks insights into the “System” category as it’s greyed out.
Hopefully, the guides above have helped you figure out the reasons you’ve got so much “System” data, and most importantly you’ve reclaimed some disk space — especially for new MacBooks pre-installed with flash storage — every gigabyte is precious!
My mac states “This Mac is no longer updating because there is not enough space to store optimized versions of your photos and videos.”
Help
would files synced from Dropbox be in my system folder? my system folder is a whopping 193GB!! but the only thing that’s on my hard drive is basically photos.
This was very helpful because my system is taking up so much storage and I was about to run out and I never knew why….
Thanks!
Wow thanks, now I can make space for my other apps when “system” took 51 GB of space
548.79GB…. for me
what’d you do to fix the massive amount of space systems took up (it takes up the same on mine)
Im downloading a game that should only be 13 gigs but my system keeps taking up the space instead and doubling it e.g 15 gigs becomes 30 gigs taken so instead of having 115 gb free i only have 90 gb free why?
Thank you my school laptop was using a whopping 112 GB of storage and i didnt want to have to turn my laptop in for inspection
My Mac shows me that I have 95GB of System storage… thats sooo much. and my MacBook Pro 2017, only has 126GB of total disk storage.
HELP
Same Story here, its a huge pain.
If your using Adobe products remember to delete your cache!
400GB … yeah it was bad, all from Adobe! Unbelievable, I’m sure there is a clear cache button in PP (to be found next time ;), but how would I have ever known!
Thank you for writing this article!!
I have a 2011 mac and i have 500 gb of storage and 449gb are taken up by “system
plz plz plz help
And mine takes up 660GB LOLLLLLLL
system storage currently at 355GB! Yikes!
Food for thought – could it be that Apple creates the problem on purpose in order to increase iCloud sales for those they do not have the time to really look into it?…
The “system” file on my computer is taking up 322 GB! I can’t download anything to help me organize and delete as there is no space. I’ve deleted almost everything else on my computer and it won’t give me back any space whatsoever. Is there anything else I can do, or should I take it in to be professionally looked at?
why is my mac taking up 788 gb of storage out of my 1 terra byte .-.
Thanks for this article, JP!
My MacBook Pro’s 1TB SSD is using 466GB for “System” storage.
I’ll start cleaning it up following your tips.
The Macintosh HD had only 33.6 GB available of 1TB.
The Documents took 28.03GB while the system took the rest of it: 910.24 GB.
Why the system took so much storage?
Help Please…. SOS
The culprit on my MacBook Pro was apple mail logs taking up 220 GB!!!!
Deleting the logs regained the space.
Turn off logging in Mail Window Connection Doctor
Having this problem right now. I seriously hate Apple. Will not buy from them again.
51GB of space? 95GB of space? Amateurs. My Late 2013 iMac is telling me I have 921GB of “System” being used.
Yes, you heard that right. 921GB. Out of a 1TB hard drive.
This is after I deleted about 300GB of files, emptied the trash can, and restarted my computer. Something ain’t right.
My problem is that while I can delete files and uninstall apps it only temporarily frees up space. I can literally see the available GBs drop in the storage overview as if something else is eating up the space. It’s hundreds of MB per minute, so it can’t be because of something downloading. It appears that System sorry of scales to eat up ANY free space.
Hi! i just downloaded CleanMyMac. Just fyi, when I clicked on the link for Dr. Cleaner app, it took me to the app store but then said it was not available anymore.
Regardless, this helped a lot. Thank you!
My Mac uses all the space in system storage and when I delete anything from mac, system storage is imediatelly full again. I cannot download and install any cleaning app due to low space.
Help needed.
Legendary! CleanMyMac found 165GB of system junk and iTunes junk. Just sitting there eating away at my storage this whole time!! WTF Apple!
I really don’t get it why does System storage take 101GB for me , Its just like every 5 minutes i use my laptop it takes it into system storage . What is is this .?
My system is so full that I can’t even download anything to it. Any suggestions? I’ve deleted pretty much everything that I can
I only have 250GB in my MacBook Pro, but then system takes up 173GB of storage. I don’t know why this is happening.
My system takes up 994.68GB out of 1TB, so I’m trying to figure out if it is also storming the previous versions of mac OS and if I can delete them.
Had the same issue, my problem turned out to be Onedrive, while I have Onedrive on an external drive the data seems to flow through the main drive. Going into my user library, containers, there were a couple of com.microsoft.onedrive folders, one which had grown to 56GB, this contained temp files for one drive.
Strangely I had changed my settings recently to not to download to my hard drive full copies, so I can only assume it got its’ knickers in a twist. Now knowing that I had nothing that needed syncing, I deleted the folder and for good measure my local copy of my one drive folder and instantly 56GB back.
Restart Onedrive, create new folder and start again.
I can’t tell you how helpful this was!!! Thank you so much for sharing. My system storage currently stands at over 200gb. I know 🙂 So am keen to reduce it asap. Cheers, Jay
I have the MacBook Pro from 2016, and my system, according to the about my Mac page, is taking up more than 230GB of disk storage. HELP HELP HELP>>>>>
Thank goodness I found this site and information. JP thank you. I downloaded CleanMyMac and removed 830 gigs, yes gigs, of system files on my Mac mini. It was so bad I had to throw some applications away to make room for the CleanMyMac download. But boy did it work.
Best $35 I have ever spent. I was ready to buy a new computer.
i have 103 GB of system taken on my macbook air 2017 plz someone help
I had the same problem and called Apple and it was an easy fix. Check under “library” and it will show what is actually taking up that space. What shows up under “About this Mac” “storage” is misleading and in my case was inaccurate as to where the problem was located.
As I understand it, where to find exactly what is taking up space is Finder – Go – Library. Then go to each folder and click on the size of each one. She said it’s usually under user files when this happens.
I had inadvertently activated screen recording and had two huge files under Quicktime.
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Purchased and ran CleanMyMac. It shows I have 10 GB of system memory. My Mac shows storage of 381 GB in system. I am left with under 100 GB to work with which is way to small for what I do (images). Any ideas of what else I can do? I’m on a MacBookPro with 500 GB of storage.
Hello, My mac is only a MacBook Air, and i only have 121 GB in total, and my system takes up to 80 GB, and now i only have 4.68 GB left, I always check for duplicate files and I have none, I am not sure why this is happening. I also really need my disk space for Education. If anybody can help then please do so.