I am looking for an application that will create a file of an arbitrary size, filled with pseudo-random data.
Must be able to create files at least 1GB in size (larger is better).
The application must work within windows, but can have a gui or be a command line tool cli.
The data need not be truly random, just pseudo-random.
The software must be gratis.
I prefer portable and open-source software, but neither is a requirement.
Note: Windows 7 SP1 is the lowest version of Windows that needs to be supported.