LCU folder is LARGE-But what is it?

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  1. Posts : 56
    win10 pro version 20H2 (OS Bld 19042.Mar)
       #1

    LCU folder is LARGE-But what is it?


    win10 ver 1909 bld18363.720
    Acer e15 core i5 8th gen 256 GB SSD 8GB RAM

    I came across this directory and am very curious to know - is it accumulated junk? Can I delete and reclaim space?
    C:/Windows/Servicing/LCU/Package_for_RollupFix~31bf3856ad364e35~amd64~~18362.720.1.0/
    with many esoteric folders which have 2 sub folders- r and f - each w/ one .mui file.
    Perplexing just to think someone coded this!!
    Thank you
    Don
    Attached Thumbnails Attached Thumbnails LCU folder is LARGE-But what is it?-lcu-directory.png  
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  2. Berton's Avatar
    Posts : 12,241
    Win10 Version 21H2 Pro and Home, Win11 Pro
       #2

    On one of my Notebooks that LCU folder is twice the size of yours. Looks like they are part of Version Upgrades or Build updates to those. Unless short on drive space I'd leave them alone.
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  3. idgat's Avatar
    Posts : 1,289
    Windows 10 Pro
       #3

    To do with Windows updates.

    Mine was 2.2GB, ran Disk clean-up and Clean-up system files (i.e. let Windows decide what to keep and/or get rid of)... now just over 700MB
      My Computer

  4. Bree's Avatar
    Posts : 22,606
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #4

    This has been discussed before....

    How to clean files in C:\Windows\servicing\LCU

    ...no one in that thread (including me) reported any problems after just deleting the files/folders in the LCU folder.
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  5. eLPuSHeR's Avatar
    Posts : 2,651
    Windows 10 Home x64
       #5

    LCU stands for Last Cummulative Update. It seems it's just a backup folder in case you may want to uninstall latest CU. I just make a backup copy using Macrium Reflect before installing any new CU. I have had no issues deleting that folder contents.
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  6. Steve C's Avatar
    Posts : 7,015
    Windows 10 Pro 64 bit
       #6

    Bree said:
    This has been discussed before....

    How to clean files in C:\Windows\servicing\LCU

    ...no one in that thread (including me) reported any problems after just deleting the files/folders in the LCU folder.
    That was my thread. I now always delete the LCU folder after checking a new update works and sfc /scannow runs without errors
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  7. Try3's Avatar
    Posts : 9,996
    Windows 10 Home x64 Version 21H2 Build 19044.1466
       #7

    Does the LCU folder just keep on growing or does Windows manage it so it is, say, just the last CU / Version update residuals and therefore never bigger than a few GB?

    Denis
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  8. eLPuSHeR's Avatar
    Posts : 2,651
    Windows 10 Home x64
       #8

    It tends to keep on growing because files are added after any CU.
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  9. Bree's Avatar
    Posts : 22,606
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #9

    Try3 said:
    Does the LCU folder just keep on growing or does Windows manage it so it is, say, just the last CU / Version update residuals and therefore never bigger than a few GB?
    eLPuSHeR said:
    It tends to keep on growing because files are added after any CU.

    I am in a position to test this, having a VM that was yet to get the April 'Patch Tuesday' CU, or the latest optional CU that followed.

    Initially LCU held just the one folder....

    LCU folder is LARGE-But what is it?-lcu-1.png

    Installing the 'Patch Tuesday' CU increased that to two...

    LCU folder is LARGE-But what is it?-lcu-2.png

    ...and then installing the optional 'D' CU added a third.

    LCU folder is LARGE-But what is it?-lcu-3.png

    But Disk Clean-up's 'Windows Update Clean-up' then removed all but the latest one. So no, it won't grow if you use Disk Clean-up regularly.

    LCU folder is LARGE-But what is it?-lcu-clean-up.png
      My Computers

  10. Try3's Avatar
    Posts : 9,996
    Windows 10 Home x64 Version 21H2 Build 19044.1466
       #10

    @Bree - Thanks for that. I'll leave it to Disk cleanup to keep things in bounds then. Denis
      My Computer


 

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