Question: [![enter image description here](https://i.stack.imgur.com/liZpX.png)](https://i.stack.imgur.com/liZpX.png)

![](https://i.stack.imgur.com/NHn5D.png)

I installed high Sierra a few months ago and nowadays there seems to be a problem with System Information.app, it always shows the disk usage wrong like for example System 40GB but it shows photos to be 0KB even though I have 19GB worth photos and DaisyDisk reports correct disk usage. 

I have tried booting into safe mode and rebooting, this persists after restarts 

Screenshot:
[![enter image description here](https://i.stack.imgur.com/BwsKp.png)](https://i.stack.imgur.com/BwsKp.png)
[![enter image description here](https://i.stack.imgur.com/MbKKj.png)](https://i.stack.imgur.com/MbKKj.png)

I have run this scan as root user not admin.

so how do fix this missing photo sizing in system information.app?

Answer: 
I had a similar problem just now: Finder, "Get Info", and Disk Utility were all reporting 18GB free on a 250GB SSD that should have had plenty of free space. Under "About this Mac"->Storage, it reported 130GB of "System" usage. None of the space was listed as "purgeable", and macOS started complaining about lack of disk space.

I found a solution in [this Apple discussion thread](https://discussions.apple.com/message/32537764#message32537764). In my case, the problem was fixed by going to Time Machine Preferences and removing an old backup drive (that had long ago died) from the list of backup drives. Immediately, the available disk space on my SSD started being reported correctly as 120GB.
I solved this issue just relaunch finder.
Click on apple logo->Force Quit->Finder and click Relaunch. 
So I opened my finder and it shows the correct size.