Windows 10 unexplained os size fluctuations


  1. Posts : 962
    Microsoft Windows 10 Professional (x64) Build 19045.2846
       #1

    Windows 10 unexplained os size fluctuations


    One day, A while back, I got a desktop notification that my os partition was was running out of room.

    This was totally unexpected. Previous to this, my 40 gb partition had about 15gb free, and suddenly I only had 200mb of free space available.

    It was not a result of a recent windows update.

    All my data is on a separate partition, and I make it a practice to only use portable programs whenever possible, situated on the data partition. I have a standard set of programs installed on the OS partition which rarely varies except for updates, and certainly nothing that word cause a sudden occupancy of 15g.

    I use Macrium, so it is a simple task to go back to a time when the OS size is normal. When this first happened, I restored a backup image, and did my windows updates, after which things seemed to be back to normal.

    But again, a few days ago, it happened again. I cant say exactly when, because I dont regularly check the OS size, but I did check it after the last windows update, and it looked normal, and no major changes have been made since.

    I again did an image restore and the windows updates, and closely kept a log of the OS size. It was initially 11.1gb of free space.

    I also noticed that rebooting the computer would result in size fluctuations. But maybe this is normal?

    I then did a disk cleanup which found a whopping 10.9gb of windows update files (which were not there before the image restore), which I deleted, but it only got me back to 12.6gb free.

    A few more reboots, and I now had 16gb free. It has now settled in at 15.5gb free.

    The size of my OS now is 24.4gb...about what it should be. Because the image I restored was a few months old, I still have to tweak a number of things, but the major space eaters are already in place and up to date.

    I'm gonna watch it closely. It's been 2 days now.

    I'd like to know if this has happened to you.

    thanks
      My Computer


  2. Posts : 962
    Microsoft Windows 10 Professional (x64) Build 19045.2846
    Thread Starter
       #2

    Maybe someone could answer this.

    I came across a thread that mentioned Windirstat.

    I ran it and the hiberfil.sys size is 6.3gb. As far as I know, I have Hibernate disabled, so I don't understand this.

    Could it be that I had Hibernate enabled in the past and the file remained there? Of course, that wouldn't explain my free space fluctuatons, would it?

    The only other conclusion I can figure is that my ssd is failing.

      My Computer


  3. Posts : 1,471
    Win10 Home x64 - 1809
       #3

    Hey kipzyxmsir,
    FYI on the Hyberfile.sys ....

    Windows Fast Startup also used the hiberfil.sys. Check the following tutorials ...

    Fast Startup On/Off - Turn On or Off Fast Startup in Windows 10 Performance Maintenance Tutorials

    Fast Startup with reduced Hyberfile - Specify Hiberfile Type as Full or Reduced in Windows 10 Performance Maintenance Tutorials

    Enable / Disable Hybernate - Enable or Disable Hibernate in Windows 10 Performance Maintenance Tutorials
      My Computers


  4. Posts : 962
    Microsoft Windows 10 Professional (x64) Build 19045.2846
    Thread Starter
       #4

    Hi Eagle51,

    Sorry, I didn't realize I has gotten a reply. Thanks for answering and that was a very helpful tip,
      My Computer


  5. Posts : 2,935
    Windows 10 Home x64
       #5

    40GB for a system partition may be too small. 75-100GB is fine. I can cope with 50GB but you must know what you are doing. You may need to use compact command to get more free space.
      My Computer


  6. Posts : 5,442
    Windows 11 Home
       #6

    I run [Batch] Windows Cleanup after every successful windows update. Note, that a single graphic driver can take 1GB, so removing older ones with Driver Store Explorer might save quite a lot. I also have 40GB partition with 28GB free (hibernation/pagefile disabled), Windows takes 8,7 GB
    Attached Thumbnails Attached Thumbnails Windows 10 unexplained os size fluctuations-capture_05102018_105856.jpg  
      My Computer


 

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