Easton

I've got my N36L MicroServer setup and working fine with Windows Server 2008 R2, although I still can't figure out how to access it via a web browser on my Mac.
I currently have the Windows OS installed on the included 160GB hard drive in hard drive bay 1.

I'd like to transfer the OS to a 2.5" hard drive or an SSD if it will be worth it?, and put it between the hard drive bay/s and the DVD drive I have installed. I'd like to use the 4x 3.5" drives for a RAID 1 setup.

I'm guessing I'd have to use the eSata port that is on the back as I have a DVD drive installed?
Will having the OS via the eSata port work OK?
Will I have to modify anything realted to software or hardware?
What is the recommended way to transfer the OS?

Thanks