This tidbit is horrifically off topic I know so forgive me, I don't want to hijack the wonderful resumption of fractal discussion that Jim Muth has triggered (thanks Jim) with a big Windows discussion. I know there are many strongly held opinions on this subject. Just to say that apparently when you upgrade to Windows 10, your old Windows 7 or 8.1 license still works. So I created a backup image of the pre-upgrade OS, and burned it back to a different SSD. I have a Kingwin replacement for my floppy drive that allows plugging in SSDs. So in an instant I can run either Windows 10 or Windows 8.1 depending on which SSD I plug in. I have kept both patched and up to date. I do this so, among other things, I can download data from my old Polar HRM that uses IrDA. IrDA support was removed without warning when Windows 10 was released. I can also use Media Center on the old version, which is protected from upgrade with Steve Gibson's Never10 utility. I have given up on Windows XP because that old machine sadly died, along with my Fractint development environment. I need to create a new Fractint development environment, maybe in a virtual Machine. I have another machine with Windows 7 because I use Media Center heavily. The point is you can have your cake and eat it too and keep your old OS when you upgrade. Good idea to have a backup anyway before upgrading. Tim (PS I see Mark has now weighed in. I don't want to prohibit Windows discussion since it has come up, but let's do let the OS discussion die down before too long, Tim says after having just continued it!)