Sorry for late reply, Jerboa has forgot how to pull my profile data and messages...
There is no issue using separate data disk for both systems. Just be carefull not to delete data from it during installation. I would detach it until everything is installed and then attach it and mount.
They will write a strong-worded protest statement.
I think that is a shot from "Babe: Pig in the City" movie, from 1998.
Install Windows on a separate SATA drive so you can remove it later without repartitioning. Also it is easier to boot, just change boot drive on startup.
Humans on average have less than 2 feet.
Ask that blonde for a date...