What of my Swap space if I choose to replace windows with ubuntu?

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http://askubuntu.com – When I install Ubunut 12.04 I'll be presented with three options - install ubuntu alongside windows, replace windows with ubuntu and 'something else'. If I choose 'replace windows' then I can not be able to make a swap space. So what then. I've 1GB ram. And if I choose 'replace windows' will my only C drive get replaced or what'll happen? If only C drive is affected then will data on the other 2 drives get saved? Again if yes, how can I access it (on which drive of ubuntu) after installing ubuntu? (HowTos)