I was checking my storage one day on my Macbook Air and found that "System" took up the vast majority of my Mac. I was able to move nearly all of my files off my mac and deleted several applications to no avail. I contacted Apple support, and they told me to re-index the spotlight index and such, but nothing they did helped my situation. Has anyone had the same issue and if so, how can I fix it? (I have been told to re install the OS but wish to avoid doing such because of the fear of ruining the computer.)

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  • ncdu /Applications/ (First install brew.sh and then brew install ncdu in Terminal)? – user2707001 Dec 10 '17 at 1:36
  • My iMac says system (High Sierra) is taking 88 GB. I don't know what to do. – jmh Dec 10 '17 at 2:15
  • @user2707001 What does ncdu tell me? It reported 90 GB used. – jmh Dec 10 '17 at 2:28
  • Sanitize your local TM snapshots: sudo tmutil thinlocalsnapshots / size urgency (e.g sudo tmutil thinlocalsnapshots / 10000000000 4). Check man tmutil! Looks like a bug or an inconsistency in/of TM & APFS... – klanomath Dec 10 '17 at 3:09
  • First, can you download a different app? macOS is notorious for giving bad readings of hard drive space. I recommend omni disk sweeper. – Harv Dec 10 '17 at 11:15

I'd download DaisyDisk from the Mac App Store. It will make a graphical mapping of everything stored on your drive. I have a similar problem and I ran it and there is no 89 GB sector on my disk. It's a little pricey at $10. A free option that does a similar task is GrandPerspective.

  • Note that daisy disk trial can be downloaded from their website and can be used to find out what files are taking up space and where, but other minor features are not enabled, such as file collection and deletion through daisy disk. – Joonas Dec 11 '17 at 6:26

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