no, the n97 has 3 drives. C drive is ur internal phone memory, e drive is ur internal mass memory of 32gb, and f drive is ur memory card.
U must keep c drive clear for ur phone to function properly. Use ur file manager to move anything u saved in c drive, to e or f drive. Go into ur camera and message settings and change the default saving memory to e or f drive. If u have any apps saved in c drive, delete them and when u download anything, always choose e or f drive to save it. If u use ovi store, u can set ur installation preferences to e or f drive in ur ovi account.
Once uv cleared out what u can from ur c drive, reboot ur phone (remove the battery for a few minutes).
And make sure u dont leave apps running, always exit properly by choosing options - exit, and that includes phone apps like messaging, gallery, settings, etc.. And clear ur web browser cache and cookies after every session.