Sansa View 8gb has no space left, but no files

I deleted all my music, video, and picture files, but the player says out of 7.55gb of space, there is only 778mb free.  there is nothing on it!  what am i missing?  I have connectied it to my computer and it says the same thing.  I can’t find any files on it anywhere.  why is so much space used up?  and by what?  any help or advice will be greatly appredciated.  I am leaving on a cross country road trip in a week and really wanted to load this up with music to listen to in the car.

Format it and everything should be back to normal.