[Wine] how do you point the c drive to a physical drive?

[dharkus]

how do you point the c drive to a physical drive?
i am currently dual booting xp and ubuntu on a machine with a 400GB HDD but my ubuntu filesystem is currently 10GB which is nowhere near big enough to install anything within the wine directory - is it possible to point the wine c drive to my xp drive named system which i am mounting automatically each time the system starts as this has my xp program files in in