Windows 10: C drive space dicreasing rapidly

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  1.    24 Oct 2016 #1

    C drive space dicreasing rapidly

    My c drive space is decreasing rapidly (at least 1 gb per day). I have bought a laptop with pre-installed windows and I have already deleted old win. I have run system and disk clean up, checked for shadow files (I had none) in the command prompt, ran my antivirus and ccleaner, deleted '%temp%', 'temp' and 'prefetch' files. I have uninstalled apps and compressed my drive and had not downloaded anything, yet my c drive is decreasing. I have run the WinDirStar program and here is the screenshot

    Click image for larger version. 

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    Oh and my notifications show that there were no new updates, so I am really confused, can somebody help me solve this problem?
      My ComputerSystem Spec

  2.    24 Oct 2016 #2

    Hi, it would help if you could monitor this for a couple of days and identify in which area files are accumulating - which folder is increasing steadily in size- without cleaning anything over the period.
      My ComputerSystem Spec

  3. TairikuOkami's Avatar
    Posts : 3,326
    10.5 Home 1803 x64
       24 Oct 2016 #3

    32GB for Windows is quite a lot. Download "WC.bat" and run it as admin.
    It will take about an hour to complete, then select to clean everything.
    C drive space dicreasing rapidly Attached Files
      My ComputerSystem Spec

  4.    24 Oct 2016 #4

    @TarikuOkami - we need to see what is increasing in size- i.e. what the cause of the concern is, being the purpose of the original post. Using a cleaner won't stop whatever it is that's filling space.

    After that, by all means consider the total size- which I wouldn't consider particularly excessive. It may contain some pre-installed stuff, and user data as well.
      My ComputerSystem Spec

  5.    24 Oct 2016 #5

    Looking at the WinDirStat output, I don't see any obvious pathologies. If we knew which folders were growing so dramatically, it would undoubtedly tell us more than we currently know. Also, if the Unknown folder proves interesting in the future (it doesn't look that interesting right now), launching WirDirStat with a right-click to "run as administrator" will often shed a lot more light on the file system analysis.
      My ComputersSystem Spec

  6.    24 Oct 2016 #6

    Thank you for all of Your suggestions I will try to monitor with WinDirStar for a couple of days and then will get back with more information.
      My ComputerSystem Spec

  7. Posts : 236
    Server 2012 R2 and Windows 10 x64 v1709
       24 Oct 2016 #7

    There's a problem using WinDirStat. Some folders restrict access - even to administrator (such as System Volume Information where windows saves restore point data). Run WinDirStat, even as admin, shows System Volume folder with size 0! Use TreeSizeFree instead and run as admin.

    TreeSize clearly circumvents Windows permissions
    > I just downloaded and ran WinDirStat as admin on my PC. WinDirStat shows System Volume Information folder at size 0
    > I run TreeSize on my PC shows it's over 3GB!!!

    /* EDIT */
    System Volume folder is always my first suspect for disappearing space - especially since it's non-obvious since most tools don't show its real size

    /* EDIT2 */
    In full disclosure, I ran the tools on a Win 7 machine, but would guess Win 10 will be the same results
      My ComputerSystem Spec

  8.    25 Oct 2016 #8

    Agreed about Windirstat and System Volume Information. The space you allocate to restore points is under your control, thus is constrained anyway so should not be of particular interest- disappointing that doesn't show it nonetheless.

    E.g. type restore (in the Cortana search box), create a restore point, configure...
    Last edited by dalchina; 25 Oct 2016 at 00:56.
      My ComputerSystem Spec

  9.    25 Oct 2016 #9

    Hello again, I have still decided to run WinDirStar today and this is what I got. Prior to running this program I did what dalchina suggested with system restore and then I pressed delete, now nothing really happened but when I ran WinDirStar my recovery file that took up 3.6gb disappeared, but I did not gain any space. Nor did I loose it yet. However, as you can see form the screenshot my unknown file became 1.2 gb. My windows folder decreased from 20.3gb to 20, as well as program files from 1.8 gb to 629.5mb, program data from 1.1 gb up to 691.9 mb. Nothing else changed, yet I did not gain any space. Here's the screenshot Attachment 107466
      My ComputerSystem Spec

  10.    25 Oct 2016 #10

    Hi, unfortunately your screenshot isn't accessible - could you edit and update your post?
    Unsure what you mean about 'pressed delete'. I only commented on System restore.

    It would be wise to try to identify what your 'unknown file' is.

    Could you post a screenshot of explorer viewing C:, showing anything which might correspond to it?
    And open a command prompt window at c: and type
    and post a screenshot
    then type
    DIR /ADH
    and post a screenshot
    then type
    DIR /AH
    and post a screenshot
      My ComputerSystem Spec

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