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Pruning your Windows 7+/Server 2008 R2+ installations and huge files in %windir%\Logs\CBS

Posted by jpluimers on 2015/10/02

This applies to at least these versions when you run them under at least VMware Fusion or Workstation:

  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows Server 2008 R2

Often this folder get huge: %windir%\Logs\CBS (normally C:\Windows\Logs\CBS)

I’ve successfully compressed the content, but even though it is text, they don’t compress that well.

Some reports indicate you can safely delete them when there is nothing wrong with your system nor with Windows Update:

So that’s what I’m going to try next.

Later: done the below on an UAC (Administrator) command prompt.

Cleanup CBS via [WayBack] Gin answering at [WayBackwindows 8 – Why is CBS.log file size 20 GB – Super User::

net stop TrustedInstaller
del %windir%\Logs\CBS\CBSPersist*.*
net start TrustedInstaller

Then I did this to cleanup the C:\Windows\SoftwareDistribution\DataStore\DataStore.edb file via [WayBack] Gin at [WayBackwindows 8 – Why is CBS.log file size 20 GB – Super User:

net stop wuauserv
net stop bits
esentutl.exe /d %windir%\SoftwareDistribution\DataStore\DataStore.edb

The reboot will restart the stopped services.


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