Sorry if the title doesn't make perfect sense, I'll try to elaborate and clarify:
I would like to buy a second internal hard drive for my desktop, and install Ubuntu (and possibly other distros in the future) on that hard drive, but I want to do so without affecting the regular boot-up for the PC. That is to say, I would like the PC to automatically boot into Windows without ever running into a bootloader or even being able to access that secondary drive at all through windows. I want to basically only be able to boot up Ubuntu by entering the boot menu manually on a restart/boot and choosing to boot from the secondary drive.
So an example would be:
C:\ 1TB Internal w/ Windows 7, boots automatically when PC is turned on, and is unable to access files on D:\
D:\ 1TB Internal w/ Ubuntu and/or other linux distros, boots only when one enters advanced boot settings when turning on a computer and manually choosing to boot from that drive.
Thank you very much in advance for any help anyone can offer with this.