Win10 keeps compressing C drive files (new and old). Cannot stop it.

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  1. Posts : 21
    Windows 10
    Thread Starter
       #41

    f14tomcat said:
    All the info is in the Tenforums Tutorial:

    Open and Use Disk Cleanup in Windows 10 | Tutorials
    Thanks a lot! I think that it is all fixed (for now). Will mark the thread :)
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  2. f14tomcat's Avatar
    Posts : 53,195
    Multi-boot Windows 10 - RTM, RP, Beta, and Insider
       #42

    esmorax said:
    Thanks a lot! I think that it is all fixed (for now). Will mark the thread :)
    You are welcome. Great to hear!
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  3. Dirk Gently's Avatar
    Posts : 102
    Windows 10
       #43

    esmorax said:

    I find it somewhat confusing that Windows just recently decided to compress all my C drive files (when it has been red occassionally for the past months),
    I think KB4023057 might have something to do with the recent spate of users suffering this problem:

    KB4023057 Update to Windows 10 for update reliability - November 15 - Windows 10 Forums

    "This update may compress files in your user profile directory to help free up enough disk space to install important updates."
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  4. Posts : 18
    Win 10 Pro 1803
       #44

    How to untag the "Compress this drive to save disk space" ?


    It may seem like a dumb question. All there is to do, is to untag it!
    But no, this does not work. Albeit, it will attempt to uncompress all files, but a large amount of files are inaccessible as they are in use. So a large portion of the disk remains compressed, and OS access to these files are inherently slow.
    So how is it possible to uncompress absolutely everything??
    I've tried all variants of COMPACT from an elevated command prompt, both in SAFE-Mode as well as normal mode, but to no avail.

    Why "Compress this drive to save disk space" was tagged in the first place?? Beats me! The Feb 2019 update from MS did this automatically - for some reason - without asking me first.
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  5. f14tomcat's Avatar
    Posts : 53,195
    Multi-boot Windows 10 - RTM, RP, Beta, and Insider
       #45

    VikingOy said:
    It may seem like a dumb question. All there is to do, is to untag it!
    But no, this does not work. Albeit, it will attempt to uncompress all files, but a large amount of files are inaccessible as they are in use. So a large portion of the disk remains compressed, and OS access to these files are inherently slow.
    So how is it possible to uncompress absolutely everything??
    I've tried all variants of COMPACT from an elevated command prompt, both in SAFE-Mode as well as normal mode, but to no avail.

    Why "Compress this drive to save disk space" was tagged in the first place?? Beats me! The Feb 2019 update from MS did this automatically - for some reason - without asking me first.
    Just to certain, you say you have tried all COMPACT variations. This is the one that will set the OS, not user and programs files, to never compress. Just making sure.

    Compact CompactOs:Never



    And this is this is the current state after I do it. I ensured it was un-checked prior to the COMPACT command.
    Win10 keeps compressing C drive files (new and old). Cannot stop it.-2019-03-02_19h44_09.png

    This will show current status:

    Compact CompactOs:Query
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  6. Posts : 18
    Win 10 Pro 1803
       #46

    f14tomcat said:
    Just to certain, you say you have tried all COMPACT variations. This is the one that will set the OS, not user and programs files, to never compress. Just making sure.

    Compact CompactOs:Never

    This will show current status:

    Compact CompactOs:Query
    As I said; I have tried all that, but thanks anyway. My main issue is that the Disc Cleanup Tool shows 4Gb of wasted space named "Compressed OS Disc" which I have found no way to delete (Clean).
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  7. Posts : 2
    Windows 10 Home 1809
       #47

    VikingOy said:
    As I said; I have tried all that, but thanks anyway. My main issue is that the Disc Cleanup Tool shows 4Gb of wasted space named "Compressed OS Disc" which I have found no way to delete (Clean).
    Just registered to this forum because I have exactly same problem as VikingOy has. I have 14Gb of files in Compressed OS Disc which I can't remove.

    Compression is disabled with command fsutil behavior set disablecompression 1 and i have run command Compact CompactOs:never

    Win 10 home 1809
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  8. Ztruker's Avatar
    Posts : 13,512
    Windows 10 Pro X64 20H4 19042.746
       #48

    What does compact /compactos:query show you now?

    Compress or Uncompress Windows 10 with Compact OS | Tutorials

    I get:

    C:\WINDOWS\system32> compact /compactos:query
    The system is in the Compact state. It will remain in this state unless an
    administrator changes it.


    Looks like I need to see about getting rid of this too. I do not want anything compacted. I have 405Gb free on my boot drive.
    Last edited by Ztruker; 08 Mar 2019 at 20:33.
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  9. Ztruker's Avatar
    Posts : 13,512
    Windows 10 Pro X64 20H4 19042.746
       #49

    I did the following:

    C:\WINDOWS\system32>Compact /CompactOs:Never
    Completed uncompressing OS binaries.

    22770 files within 20217 directories were uncompressed.

    C:\WINDOWS\system32>Compact /CompactOs:query
    The system is not in the Compact state. It will remain in this state unless an
    administrator changes it.
    Last edited by Ztruker; 08 Mar 2019 at 20:32.
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  10. Posts : 2
    Windows 10 Home 1809
       #50

    Ztruker said:
    What does compact /compactos:queryshow you now?
    I get:

    C:\WINDOWS\system32> compact /compactos:queryThe system is in the Compact state. It will remain in this state unless administrator changes it.

    Looks like I need to see about getting rid of this too. I do not want anything compacted. I have 405Gb free on my boot drive.
    I get:
    The system is not in the Compact state. It will remain in this state unless administrator changes it. I have a 256Gb m.2 SSD and 181Gb free on that drive.

    I just downloaded Treesize and I'm checking that through. Some of these folders are blue, why is that? Compressed?

    Do you notice anything unusual?
    Win10 keeps compressing C drive files (new and old). Cannot stop it.-sieppaa2.jpg

    Win10 keeps compressing C drive files (new and old). Cannot stop it.-sieppaa3.jpg

    Win10 keeps compressing C drive files (new and old). Cannot stop it.-sieppaa4.jpg
    Attached Thumbnails Attached Thumbnails Win10 keeps compressing C drive files (new and old). Cannot stop it.-sieppaa.jpg  
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