Mac OS X
This is very different from the way a Mac works. Windows has a Master Boot Record, which is the first thing that loads up. Windows then labels the drives in boot order as "C, D, E, F, G, etc". The "C" drive is always where the Operating System lives, which will be his Solid State Drive. All applications will install to this drive by default, which is what he wants since it's his fastest drive. All other files and data he should keep on a separate drive.