Hello,
Are you running an IDR of the local server or a remote system? Do you get any error while you try to modify C drive?
Refer to the following technote on IDR:
http://support.veritas.com/docs/192923
If the above does not help, revert with the exact issue.
Note : If we do not receive your reply within two business days, this post would be marked �assumed answered� and would be moved to �answered questions� pool.
Regards.