Why does the 2023-05 CU for Windows 11 Version 22H2 for x64 contain several wim images and is 9GB in size in WSUS?

blueblade 26 Reputation points

I noticed a large increase in the size of Windows 11 patches in WSUS starting April 2023;
The May 2023 W11 cumulative update is the same way-- many files that are multiple GB's in size according to WSUS, but it is only a single update file that is much smaller at the update catalog?

Case in point this patch:

2023-05 Cumulative Update for Windows 11 Version 22H2 for x64-based Systems (KB5026372)


It's only 275 MB at the update catalog-- a single MSU file.

However If we look at the same patch in WSUS to see its file details, i.e. using powershell:

(Get-WsusServer).GetUpdates() | Where {$_.Title.Contains('2023-05 Cumulative Update for Windows 11 Version 22H2 for x64-based Systems (KB5026372)')} | foreach {$_.GetInstallableItems().Files | Select Name, OriginUri, TotalBytes} | Format-List

This outputs a list of many files including several .WIM images, totaling ~9.2 GB in size!

April's CU was similar, but the March CU wasn't humongous like this.

This seems like possibly a mistake?

Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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Windows 11
Windows 11
A Microsoft operating system designed for productivity, creativity, and ease of use.
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Accepted answer
  1. Adam J. Marshall 9,041 Reputation points MVP
    1 person found this answer helpful.

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