How do I delete everything off a hard drive?

Girafficorn

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Aug 25, 2014
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So soon I'm getting an ssd so I was just going to delete everything off my hdd and use it as a data drive but the only tutorials that I've found is reformatting the drive but I don't want the os on it either. Could I just literally select all the files on the hdd and press delete? That won't break it or anything?

Thanks on advance!