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  1.    12 Oct 2016 #1
    Join Date : Jul 2015
    Posts : 267
    Windows 10

    Scary Windows 10 disk cleanup. Should I run it.

    One day after the latest update, computer is running fine, I then ran the built-in disk cleanup including system cleanup and here's what I got.

    Windows Update Cleanup 3.99 TB – holy cow.

    My total drive is using about 40 GB, I wonder where this 3.99TB is located. :-)
    Click image for larger version. 

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      My ComputerSystem Spec
  2.    12 Oct 2016 #2
    Join Date : Jun 2016
    Posts : 20
    Windows 10

    Looks about right, lol. Yes, it's safe to run it.
      My ComputerSystem Spec
  3.    12 Oct 2016 #3
    Join Date : Oct 2014
    New Jersey
    Posts : 1,386
    Windows 7 Pro x64 Windows 10 Pro x64

    Mine showed the same thing when I ran it the 1st time

    It`s that new file system.
      My ComputersSystem Spec
  4.    12 Oct 2016 #4
    Join Date : Jan 2014
    Get Off My Lawn
    Posts : 4,647
    Win10 Pro

    Mine was exactly the same, I let it remove all of it.
      My ComputersSystem Spec
  5.    13 Oct 2016 #5
    Join Date : Jun 2015
    Posts : 2,079
    Windows 10 Home x64 (Laptop), Windows 10 Pro x64 (Desktop)

    Yes, I had the same on 2 PCs. It.s safe to disk cleaner and recover the space.
      My ComputersSystem Spec
  6.    13 Oct 2016 #6
    Join Date : Jul 2015
    Posts : 866
    Windows 10 Home x64

    It seems to be a quirk with latest 321 build. On an older AMD Phenom it just rebooted spontaneusly when running it.
      My ComputerSystem Spec
  7.    13 Oct 2016 #7
    Join Date : Mar 2016
    Posts : 153
    win 10 HOME

    yes i seen the same on my toshiba sat and it really bothered me glad of sorry ? im not alone

      My ComputerSystem Spec
  8.    13 Oct 2016 #8
    Join Date : Feb 2015
    Bamberg Germany
    Posts : 17,552
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu

    Opening up an admin prompt and pasting this in: Dism.exe /Online /Cleanup-Image /AnalyzeComponentStore will get rid of it faster than Windows Update Cleanup(at least it did for me).
    Cumulative Update KB3194798 for Windows 10 PC Mobile build 14393.321 - Page 8 - Windows 10 Forums
      My ComputersSystem Spec
  9.    13 Oct 2016 #9
    Join Date : Aug 2016
    S/E England
    Posts : 4,488
    10 Home x64 (1709) (10 Pro on 2nd pc)

    Scared me too the first time I saw this back in August. That's when I found the explanation (which Cliff S quotes in the above linked post). It's safe to let Disk Clean-up run, but @Cliff S's method is a neater and faster solution.

    @EdTittel has also picked up on my post and explained in far more detail than I could how this can happen.

    Thanks, Bree for the explanation and resource. It provided the inspiration for my blog post today.
    Windows Update Clean-up files 3.99TB
      My ComputersSystem Spec
  10.    13 Oct 2016 #10
    Join Date : Jul 2015
    Posts : 267
    Windows 10
    Thread Starter

    Really helpful responses. Thanks guys. My cleanup took about 15 minutes of sheer agony. But after restart all is well.

    This forum is awesome, learn something new every day.
      My ComputerSystem Spec

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