How do I restore my disk space? It's a Dell Inspirion?

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I used to know how to do this but I forgot. I know it's in the option when I start the computer. Right before the dell message on screen, I'm suppose to press some "F" button but not sure which one. I think it's Ctrl+F12, or that's what I thought but it's not.

I'm trying to erase everything. Make my computer into a state when I got it, so pretty much brand new with nothing on the hard drive. If anyone knows those controls, please let me know. Thanks!
 
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