This is considered a best practice - to move system databases off of the c drive. I move all of my system databases to a different volume when possible.
Here is an article on how to do it.
http://msdn.microsoft.com/en-us/library/ms345408(v=sql.105).aspx
Jason...AKA CirqueDeSQLeil
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I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
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