Formatting G And F drive shows error

hello friends
i am in a serious trouble. I don’t know wht happened to my system. One day while booting it showed a message like F and G drives are locked and they couldnot be scan checked. And showed My dektop.
Then i opened mycomputer . It shows everydetails except the information about G and F drive
I opened F and G drive. Then it opened .and i could open all my files.
But i decided to format G and F drive . so i move all files from both of them.
And start formating. Then it shows only 9 % is completed. and the disk is either locked are some error has occured.
I don’t know what to do please help me..