is there an advantage to using another drive vs creating a disk image to save?
We each may have our own reasons but mine is so I can mainly use Win7 yet not give up the "free" upgrade. I don't like some of the more Win8 like features of the desktop that Win10 has but once I have set things up as I want then maybe I'll just go Win10.
Originally I think there was no going back but sounds like you can now, at least for 30 days or so.