require 'win32ole'
require 'socket'

host = Socket.gethostname
cs = "winmgmts://#{host}/root/cimv2"
begin
	wmi = WIN32OLE.connect(cs)
rescue WIN32OLERuntimeError => e
	raise "Unsupported Windows Version."
else
	query = "select * from Win32_LogicalDisk"
	hd = wmi.InstancesOf("Win32_OperatingSystem")
	hd.each { |f| puts f.FreeSpace }
end