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#31
Windows 8 will fit on 30 GB. Windows alone takes maybe 20 GB.
But if you have a significant number of applications installed and keep Window updated, you will run out of space quickly.
My original installation grew to above 30 GB within a year. If you want to stay within 30 GB, you would have to be very careful about what you install.
I have used only 38 GB for Windows after 5 years on Windows 7, with about 55 applications.