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I did a disk cleanup to free about 1GB of space, to realize moments after it was consumed by something once again. How can I find out what took that space?

Alex Weitz
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  • Possible duplicate of [How can I visualize the file system usage on Windows?](http://superuser.com/questions/8248/how-can-i-visualize-the-file-system-usage-on-windows) – DavidPostill Mar 13 '16 at 14:51

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Check your Windows directory for a directory named $WINDOWS.~BT.

This folder is hidden by default. To this folder Windows 7 downloading Windows 10 update in background.

To prevent this you have to remove a specific Windows Update: KB3035583.