When you upgrade Windows, you may notice that the disk space that contains the operating system is noticeably reduced. There can be many reasons, but the main reason behind this is usually a new folder that is created when you install your update. For example, if Windows is installed on the C: drive, you will notice that there is an additional Windows.old folder.
For those who don't know, Windows.old is a folder that is automatically created when you upgrade to a new version of Windows. It essentially contains files from your previous installation, saved programs, some user data, essential Windows components and files, and more.






