Nokia/5233 handset
Internal memory

Hi sir, my name is dinesh. I have nokia 5233 handset.it is having problem with a internal memory. It shows total internal memory 80mb. But if i acess then it shows 30mb excluding the application and 50mb used by other files.i am not able to make out where the 50mb has been stored. I have updated software 3-4 times. But i didnt get any solution.this is my number 919805529747