> whereas windows seems to place it in the middle of a system c-drive.
In a single-drive system, you can easily get into the state of "swap a page out to disk, load a page of data for a program". This creates a hell of a lot of head movement. The middle of the disk is a compromise between transfer times and seek times (seek times take a lot longer).
Consequently, when you have two drives, with the swap on one drive and the data on the other, you can swap a page and read a page, and neither head moves anywhere.
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