<A href="http://www.pcworld.com/businesscenter/article/248342/windows_8_secure_boot_the_controversy_continues.html#tk.rss_news" target="_blank">Microsoft is requiring manufacturers of ARM-based devices to enable "secure boot"</A> so it can not be disabled. This locks the devices against any other operating system. <A href="http://www.theregister.co.uk/2012/01/18/windows_8_linux_secure_boot/" target="_blank">They're being only slightly more open in their requirements for non-ARM devices.</A>