How do I install Mountain Lion AND format the hard drive?

I want to do a completely clean install of Mountain Lion.
I had Snow Leopard installed, upgraded to Mountain Lion (by buying it from the App Store) but how do I tell it to format the drive and then install Mountain Lion?

pforkes wrote:
I want to do a completely clean install of Mountain Lion.
I had Snow Leopard installed, upgraded to Mountain Lion (by buying it from the App Store) but how do I tell it to format the drive and then install Mountain Lion?
Snow Leopard would have needed to be installed on a properly formatted drive, so I don't understand why you would need to format it again to that same format.
Cheers
Pete

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    pforkes wrote:
    I want to do a completely clean install of Mountain Lion.
    I had Snow Leopard installed, upgraded to Mountain Lion (by buying it from the App Store) but how do I tell it to format the drive and then install Mountain Lion?
    Snow Leopard would have needed to be installed on a properly formatted drive, so I don't understand why you would need to format it again to that same format.
    Cheers
    Pete

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    Make Your Own Mavericks, Mountain/Lion Installer
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    Select the volume you just created (this is the sub-entry under the drive entry) from the left side list.
    Click on the Erase tab in the DU main window.
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