High Sierra disk space issues
This seems to be a high Sierra Bug it is not even fixed in the latest software update which is 10.3.1 I guess. I have the latest version installed and ever tim it shows that system uses up 40GB even though I have 20GB worth of hoots it always shows 0KB. So I don't know how to fix this but hope that another software update fixes this.Try running df in terminal located in Applications>Utilities it should work because it works fine for me.