In the same vein as Quickly create a large file on a Linux system,
I\'d like to quickly create a large file on a Windows system. By large I\'m thinking 5 GB.
The simplest way I've found is this free utility: http://www.mynikko.com/dummy/
Creates dummy files of arbitrary size that are either filled with spaces or are filled with non-compressible content (your choice). Here's a screenshot: