What is filling up my Mac hard drive WHILE I am watching it?

Mac Mini. Running OS Sequoia 15.5

250 Gig HDD

I have less than 5 Gig left on it- and I don’t keep ANY large files on it. Everything of size lives on a 1 Tb external drive on the desk.

I’ve run BOTH of my anti-virus softwares and they’ve found nothing. I use Avast AND Malwarebytes.

At this rate, in a few hours the HDD will be locked up.

Quite worried.

I’ve run the Storage check and in terms of large files I find:

System Data: 154 GB

macOS: 42 GB

Applications: 28 GB
I’ve cleared the Cache and Temporary Files.

Help !

I cannot completely empty my Cache. Even when inputting my Admin info, which is requested, these are the folders that are parked. Note the – sign next to 3 of the 4 of them. That’s a red minus sign at the lower right corner of the blue folder icon itself.

I cannot open or delete these:

com.apple.amsengagementd.classicdatavault

com.apple.aned-

com.apple.aneuserd-

com.apple.iconservices.store-

How can I not be able to delete these?? A check of them does not reveal a folder size, so no way to know if they are the culprit.

Title says it all.
Mac Mini 8 Gigs RAM

Mac OSX Sequoia 15.5
250 Gig HD

Capacity: 245.11 G
Available: 7.7 Gig
Used: 219 Gig ( No clue why 20 Gigs are not adding up here… )

I’ve just purged the Caches. Bought me a measly 2 Gig storage space.

I’ve run both AntiVirus packages I use- Malwarebytes AND Avast Premium Security. No bugs found.

No clue why the System Data takes up 153 Gigs. It’s ahead of:

macOS: 38 G
Applications: 28 G

I’m unsure if I can even run Time Machine to back up this computer, in case it does literally run out of space and bricks.

Any thoughts on WHY something is slowly eating through my storage space??

Try the instructions here to see hidden files.

Others have commented that they got 200GB+ back.

That is strange. Off the top of my head I’d have said it sounds like you’ve got something causing logs to be written at an out of control pace. OSX is a version of ‘nix and I’ve seen Linux systems act similarly when they get cranky.

Unfortunately I’m not familiar enough with OSX to know where those logs would be stored.

@Cartooniverse: I merged your threads, I have no idea why you started a second one.
Computer questions generally belong in In My Humble Opinion.

Moderating:

ETA: Good luck with the issue, hopefully someone has the answer.

You might have old APFS snapshots hanging around. Having snapshots means that deleting files will cause you to use slightly more space, instead of freeing the space used by the file. Here is a short article from Apple on using Disk Utility to see if there are any snapshots, and delete them.

I generally don’t think these kinds of tools are super useful for the average user in an everyday situation, but have you considered running a utility like CleanMyMac? It will purge all manner of stuff (including things like runaway logs) but will also help identify where, specifically, your disk space is being consumed.

Your system data file size for your Mac Mini is enormous! It should only be about 20 GB at the most. What in the world is in there?! Perhaps your machine is saving copies of the old Mac OS when it updates to a newer version.

Try some software like one of these. They provide a visual representation of what’s using space.

I’ve used GrandPerspective and JDiskReport but don’t have a specific recommendation for “best.”

I am quite fond of GrandPerspective.

One thing that Grand Perspective made me aware of was that Malware Bytes was methodically filling up my hard drive with tiny little files. I deleted them, gained about 325 GB, only to find that 9 months later Malware Bytes had done it again. This time I deleted Malware Bytes itself as well as its tiny little files.

Recounted in more detail here:

I strongly discourage using this!

Many thanks ! I started the 2nd one because the 1st one showed for a moment, then- on my screens- disappeared entirely.

“View APFS snapshots” within Disk Utility is grayed out= not an option for me. No idea why.

You might want to open Activity Monitor,
And look at Disc Activity, sorted by writes, and see what’s going on.

You might have to use the command line tmutil program. Open a terminal and run the following commands.

tmutil listlocalsnapshots /
tmutil listlocalsnapshots /System/Volumes/Data
tmutil listlocalsnapshots /System/Volumes/Data/home

Those might not show anything, and if they don’t, then you probably don’t have stale snapshots taking up all of the space. If they give errors, then run mount to see where things are mounted, and what filesystems they use. If necessary run tmutil using your actual mount points.

It may not be a snapshot issue, but this is pretty easy to check, and if it is a snapshot problem, then nothing else you do will help. Older versions of MacOS used to have a big problem with failed Timemachinie backups causing snapshots to be left behind.

A tool that graphically shows how much space each directory uses is invaluable in finding where your space has gone, if it is just due to regular files. Sorry I can’t recommend one, but the suggestions earlier in this thread might be a good starts.

I recently dealt with a Windows computer that was inexplicably out of space, and it turned out to be Adobe Acrobat updates. Acrobat would download a 1GB update, fail to install it, then download it again a few days later, fail to install, and repeat until the disk was full from 150 different Acrobat updates. A graphical directory size utility made finding the problem easy.

Opened it up, cannot find where to filter by writes. Checked options under Finder/View.

Help?

I DO see that “kernel_task” uses 327 Gb of virtual memory. Unsure how this is possible: I have 8 Gig of RAM and a 250 Gb HDD…

Well, what the hell. Using “OmniDiskSweeper”, a free Mac-based file exploring tool, I found a 4- Gb video file.

At some point I started recording my screen a year ago, and it’s a huge file. Dumped it into the Trash, will empty and restart the machine now.

No doubt there are other offenders as well.

Open Activity Monitor.
Click the Disk tab.
Click the Bytes Written column header until the triangle is pointing down.

This will sort the list in order of highest number of bytes written to disk.

Hmmmm. This is embarrassing. I did as you suggested: Activity Monitor. Disk tab.

No columns appear, nor does the activity window change. When I click on Disk, the only column that appears is on the far left and is entitled " Process Name ".

What am I missing?