So even though a file can be located in more than one folder, it’s actually only occupying hard disk space in a single location – the rest of instances are just hard links of that file. Thanks to this hard link concept, Windows is capable of keeping multiple instances of the same file in different places (but only virtually). A hard link is a file system object that enables two different files to refer to the exact same location on a disk. The apparition of this weird bug is due to hard links. As you can imagine, the update contains a minor bug that will trick the Disk Cleanup tool to the point where it miscalculates the size of the Windows Update Cleanup folder.
As it turns out, the issue is entirely caused by the installation of the KB3194798 update on Windows 10. A lot of users have been reporting a weird bug where the Disk Cleanup tool (cleanmgr.exe) of Windows 10 is incorrectly displaying 3.99 TB as being actively taken by older Windows updates.Īs exciting as this might look, this is only an esthetic bug and will not magically grant you more hard disk space. If you’re using Disk Cleanup regularly, you might be scratching your head after applying the latest Windows 10 cumulative update.
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