i don't know whats happening

I have the sansa clip plus 4gb and i love it but i resently have had a major problem when i plug it in to my computer it says i have no space. So i deleted everything off of it now when i pug it in it tells me i only have 2.02 gigs left when there should be four. Has anyone else had this problem or know how to fix it ? thanxx

Did you try reformatting from the Clip itself, under system settings?