Have a spare HDD - Want to install High Sierra on it w/ Dual Boot

I have a spare HDD laying around, and I want to install MacOS HS on it. I plan on putting it in my windows rig, and somehow using it as a dual boot with Windows. But, each OS needs to stay on a separate HDD, and my Windows rig already has a lot of files stored on it, so wiping it and installing MacOS then using bootcamp w/ windows isn't an option.

Is this possible? If so, how?

My rig: FX 8370, GTX 970, Gigabyte MOBO

submitted by /u/bfkpu
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