[DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)][return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetDiskFreeSpace(
string lpRootPathName,
out uint lpSectorsPerCluster,
out uint lpBytesPerSector,
out uint lpNumberOfFreeClusters,
out uint lpTotalNumberOfClusters
);