I think you mean have an existing hard drive for Windows, and add a new one for Linux. If this is the case, then yes, it will work.
Simply add the harddrive, and let the Mandrake Installed do the rest for you. LILO should have an entry for Linux and an entry for Windows.
May I suggest a newer version of Mandrake though, such as v10.0...
I hope this helps
--Ian
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