bootleg audio system

Newegg wants $140 for a full version Retail copy of windows 10 Home with the activation key. After looking on Amazon for a retail version, I find a Pro full version with key for only $125. Now here is where it gets interesting. I emailed the seller to find out about his return policy and i also...

I currenlty have a ssd boot drive I am happy with, but I want to use M.2 for gaming. Do I have to install windows 10 onto my M.2, in order to use it for storage. Most videos are for set up and cloning windows onto the drive. I just want faster loads for gaming, i.e. E: drive.