Windows 10: What is CBS.log? How to read CBS.log file in Windows 10

You may stumble upon an error in Windows 10 when Windows Update or System File Checker fails Such errors are stored, inter alia, in the CBS.log file. In this article, we are going to see what is CBS.log, its location, and how to view a CBS.log file in Windows 10.

What is CBS.log




CBS or Component-Based Servicing is a file that has logs about the installed and uninstalled Windows Update component. So, information of your Windows Update is stored in these log files, even the System File Checker (SFC) writes to CBS.log.

CBS.log file location


CBS.log file will always be present on your Windows computer. If you are curious and want to check the file, launch File Explorer (Win + E), and navigate to the following location.



C:\Windows\Logs\CBS

There you will see a file name, CBS.log. This is the very file that contains the information about your Windows Update component.

How to read CBS.log file




To read log files, you can just go to the following location and read the log file.

C:\Windows\Logs\CBS

However, if you just want to read the SFC file, it is not the best option.

For that, launch Command Prompt as an administrator, type the following command and hit Enter.

findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfclogs.txt

This will create a file, sfclogs.txt, on your desktop. Double-click on it to open the file with Notepad and read the file. You will see “SR” written in front of every transaction. This means all the programs shown here are of SFC.exe.

Can I delete CBS.log file?


CBS.log file is essential to your computer as every time you install a new Windows Update, it writes to the CBS.log file. However, if you think it is eating a huge chunk out of your Hard Drive, you can delete it as it won’t have an adverse effect on your computer.

Before doing that, make sure to disable the Windows Update service from Services (that you can launch from the Start Menu).

Now, you can delete the CBS.log file and you won’t receive any error message.

Corrupt files logged in CBS.log


Some Windows may see an error saying as following

Windows Resource Protection found corrupt files but was unable to fix some of them, Details are included in the CBS.Log windir\Logs\CBS\CBS.log.
​

To fix this issue, you may need to Run DISM.

Read Next: SFC not working, will not run or could not repair the corrupt file.


This article What is CBS.log? How to read CBS.log file in Windows 10 first appeared on TheWindowsClub.com.

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Need help reading CBS log Entrys

Here is another way to obtain your cbs log.......................

Go to File Explorer > click This PC > click open C :drive > open Windows > open Logs > open CBS > cbs log should be at the top of the list. > open it and the log is in Notepad.

 

Understanding the CBS log & repairing corrupt files

I've been getting some event errors lately, in particular 2 errors.

Date: 10/21/2019 8:54:17 AM
Type: ErrorEvent: 1020Source: Microsoft-Windows-Perflib

The required buffer size is greater than the buffer size passed to the Collect function of the "C:\Windows\System32\perfts.dll" Extensible Counter DLL for the "LSM" service. The given buffer size was 34008 and the required size was 45368.

Date: 10/21/2019 2:07:45 PM
Type: WarningEvent: 1008Source: Microsoft-Windows-Perflib

The Open procedure for service ".NETFramework" in DLL "C:\WINDOWS\system32\mscoree.dll" failed with error code The system cannot find the file specified.. Performance data for this service will not be available.

So I went to https://support.microsoft.com/en-us/...rrupted-system and ran

sfc /scannow

I got the message:
Windows Resource Protection found corrupt files but was unable to fix some of them.For online repairs, details are included in the CBS log file located at windir\Logs\CBS\CBS.log.

I tried to follow the rest of the steps listed on the support page, but got lost in the details.

1. When I used an elevated Powershell & ran the suggested command, I got:

PS C:\> findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfcdetails.txt"

out-file : Could not find a part of the path 'C:\%userprofile%\Desktop\sfcdetails.txt'.At line:1 char:1+ findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\s ...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : OpenError: ) [Out-File], DirectoryNotFoundException + FullyQualifiedErrorId : FileOpenFailure,Microsoft.PowerShell.Commands.OutFileCommand

2. I manually went to C:\Windows\Logs\CBS & opened CBS.log.There was so much detail that I couldn't follow what was corrupt. I've attached the log.

I would appreciate anyone telling me what files are corrupt & how to replace them. Thank you in advance!

 

C:\Windows\Logs\CBS Log\CBS folder is missing in W10

If I take your path as-it-is you wrote with the last CBS not being a typo, the path is incorrect sir.

The path is C:/Windows/logs and there should be a file named CBS.log there.

Share that on onedrive and drop a link here.