Two HDDs on a Mac Pro to work off two different OS

Good Morning... I have a early 2009 Mac Pro 4,1 and it has two internal HDDs and 10GB(2x4GB & 2x1GB) RAM; one HDD which is 500GB is the main HDD for the kids plus wife and the 2TB HDD I want for my music & etc... Now my question is how can I be able to operate the second HDD (2TB) without the kids and wife having a way to access that drive? And as far as partitioning the 2TB, I've done so but it's not showing up on the desktop with an image... Can someone help me get this problem solved? Thank you!!

Mac OS X is inherently a Multi-User system.
Each user should have their own account, with a password. There is also a picture associated with each account, and non-Readers should be trained to recognize an Icon or a picture of themselves. (Whether each User keeps their password completely secret is up to you.)
Once this is implemented, other users have no access to your files.
Mac OS X keeps Sytem Information completely separate from User information. For the most part, the System Information does not change. Preferences are stored in User Accounts, not with the System.
Unless you really need multiple versions of Different Mac OS X, there is no need to have separate Boot Drives for different users. There is an optimization that can be made that uses the System on a different drive from Users files. It is described in this tip:
User Tip: Creating a lean, fast Boot Drive

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I was wondering whether it was possible to install 4x 2TB Black Caviar and 2x SSD drive in a dual Mini-mount in one optical drive space?
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Firstly, I cannot offer any advice regarding Parallels or VM Fusion, because I am in the very, very fortunate position of not having to use Windows in any way, shape, or form on my system!
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http://eshop.macsales.com/owcpages/multimount/multimount.html
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http://eshop.macsales.com/item/Newer%20Technology/MXPCIE6GS2/
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http://eshop.macsales.com/installvideos/macpro2009esata/
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Two HDDs on a Mac Pro to work off two different OS

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