Ubuntu 12.04.1 and Windows 7 on same PC

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http://askubuntu.com – Have Ubuntu installed on a 1TB SATA 3 Hard Drive. Also have Windows 7 installed on a separate 1TB SATA 3 Hard Drive. Unplugged Windows Hard Drive before installing Ubuntu as previous versions of Linux always destroyed my Windows installation. What will happen when I plug in the Hard Drive with Windows 7? Will I get a boot loader that will allow me to choose either OS or will 1 or both OS's get wiped? The computer has UEFI support and uses the ASUS M5A-99X EVO motherboard. (HowTos)