if you put the OS on two seperate drive you will have to prompt the boot menu to select where you are booting from instead of it automatically coming up as it would using the discpart method and having them on a singel drive, I used to dual boot 7 and XP in all my build and diskpart had a 100% success rate for me and was all that and a big bag of chips, but it does look like 7 & 8 may have some querks, I would read up on it as having them both on an SSD would be way cool if you can partition SSD's with out permenant damage
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