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I would also put the Window page file on the second drive and make it static, meaning that the size doesn't change, which avoids fragmentation of this page file. The general opinion is to make the page file 1.5 times the size of your RAM (see attachment).

Of course, it's better not the put the page file on the same drive as the Photoshop scratch disk, although I've never seen any major negative impact. Of course you're pretty much in a catch-22 when you have two drives and not three.

In this example of my own system the actual Photoshop scratch disk is on S:, which is the third drive (D: is just a logical partition).