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Disk Cleanup in Windows 10 reports "Windows Update Cleanup" of 3.99 TB size
Windows 10's "Disk Cleanup" tool may show a size of 3.99TB for "Windows Update Cleanup". A newly released tutorial explains that this is a common bug caused by the KB3194798 update. If you want to fix it, there are several options.
By: FL Utils
This is not a problem but an annoying bug caused by the KB3194798 update from Microsoft. The update fixes several potential issues inside the Windows 10 system, and unfortunately causes the Disk Cleanup system to show 3.99TB whenever it's downloading from the Windows Update service.
To understand what is happening, you need to appreciate how updates work on Windows. Since XP, Windows has searched Microsoft's servers for the latest updates whenever you turn on your PC. If the server has any updates which are deemed missing from your system, the system will begin downloading them. These downloads work just the same as through a web browser - a set of data is being pulled through the Internet.
The bug for the Disk Cleanup tool has been defined to mistake the download progress for unlimited file size. Specifically, when Windows is downloading the update, it puts the data into a temporary file. Because this file will be constantly expanding in size, the Disk Cleanup facility believes that it is the highest possible size a file can be (3.99TB).
To fix this, you just have to wait for Microsoft to release is a new update to ensure the file size can work correctly. We have heard that there is a new update in the works to resolve the issue, but to be clear this is not a malicious problem, just an annoying - harmless - bug.
You can see how to fix the Windows 10 Disk Cleanip 3.99TB issue here: