I'm a member over at eight forums and have just registered here, hello!

Windows 10 Pro was/is my default operating system - I've just installed Windows 10 EDU on a different partition on the same SSD. (One install needs Java 6 update 6 where my work systems use them. The fresh install requires the most recent Java version for IDEs to function correctly.)

Purely a question for my own benefit, some could argue it's trivial: The partitions that I've filled with a yellow colour shown in the below image - do they serve both operating system installs, and (low level answer welcome) why?

Click image for larger version. 

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Many thanks!