Disk Space - Free Space fluctuates


  1. lionwing
    Posts : 19
    Win10
       New #1

    Disk Space - Free Space fluctuates


    I have a 1TB SSD divided into three partitions.

    "C" is the Windows partition while D & E are for games and general storage.

    The amount of available on C seems to fluctuate for no apparent reason. A week ago I had 37GB free and now have 27GB free. Yes Windows installs updates etc and a regularly clean the disk using "Disk Cleanup" and the "Clean Up System File" utilities.

    Nothing significant has been installed on the C Drive for sometime with Windows and the User folder dominating the used space on the drive.

    While this isn't a problem I do wonder why the free space can vary with no obvious cause?
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  3. CountMike
    Posts : 19,518
    W11+W11 Developer Insider + Linux
       New #2

    Possible culprits: hiberfill.sys, prefetch and memory page files, One drive local files.
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  4. Steve C
    Posts : 7,898
    Windows 11 Pro 64 bit
       New #3

    System restore will use significant disk space. I use CCleaner to review and delete unneeded restore points - you need to run in admin mode to do this.

    I also use Wise Disk Cleaner and PatchCleaner in addition to Windows Disk Cleanup.
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  6. Bree
    Posts : 31,622
    10 Home x64 (22H2) (10 Pro on 2nd pc)
       New #4

    lionwing said:
    A week ago I had 37GB free...
    Steve C said:
    System restore will use significant disk space...
    ,,,and is a likely suspect. You would have had the latest cumulative update within this last week. The first thing a CU does is make a restore point.

    Windows itself can actually tell you in some detail what's using the space. Open Settings > System > Storage.
    Click on This PC (C:) to get an overview of the use, click on each section in the overview to get more details (and some management options).
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  7. lionwing
    Posts : 19
    Win10
    Thread Starter
       New #5

    ...and now I have 53GB!

    There may have been a system restore point in there created prior to the most recent update but the rest is beyond me!

    Fun n games with PC's.
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