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#11
Lady Fitzgerald stated one really good reason for keeping your data on a separate drive - you can remove the data drive if you need to bring your computer in for service. (You stole my thunder!)
Another good reason to keep your data on a separate drive is that it simplifies backups. Basically, you back up your Windows drive every now and then (say once every one or two months), and you backup your data drive regularly, say once a week.
I have two hard drives in my main computer - one for the OS (Linux, in my case) and the other for my data. And the data drive is shared; it is the data drive for all of my computers.