Deleting Everything Off an HDD?

SanFran2700

Reputable
Apr 4, 2015
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4,510
I'm new to the whole PC scene, being that i've played console basically my entire life. I've built my own PC (mostly for gaming). So I downloaded Steam OS, and I was wondering, when I get a copy of Windows, how do I delete everything off my HDD so I can download Windows?

Any help would be greatly appreciated! Thanks.