Mac Not Recognizing External Hard Drive, I Want to Use the HDD to boot Windows

Let's get this stuff straight first:
The Hard Drive is from a PC that I am not using
The Hard Drive already has Windows 8.1 installed as well as all my documents and data. (from the old PC, of course.)
It does work, however after connecting it to my iMac (late 2014 / 5K Retina) it isn't recognized by Finder, Disk Utility or the (Option) Boot screen.
Yes, I understand I will need to install drivers, so I'll need help doing that as soon as we get Yosemite to recognize the HDD.
What I am wanting to do is use this external drive to run Windows from the boot up screen. But I need OS X to actually recognize the drive in the first place. Then I'll need a little help installing the drivers for Windows onto the Drive, unless those are already installed, since it was originally used in my PC? (I'm not sure how drivers work.)
Nonetheless, if it's not possible to be used as an external boot for Windows, I'd still like to use it to obtain and store files/documents on.
Thanks guys!
-Austin

How do you have the drive hooked up to your computer? Did you but an adapter? If so, is it one that is supposed to work with a Mac? Did it come with a power supply?
Some of those USB adapters don't work well with Macs and that could be causing problems. Test it on a PC if possible, just to make sure the adapter itself isn't bad.
~Lyssa

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