When C:\ is required, there is very little you can do to convince the system otherwise - making free space on C:\ a very precious commodity.
Literally, too, as mass memory content outweighs C:\ to the tune of 5500% on the N8 and 2000% on the E6...
Memory card outweighs it by 11000% on the N8 8000% on the E6.
So, C:\ is indeed an asset to be cultivated and cared for accordingly.
In my opinion, anyhow.