USB troubles

{ScarFace}

Likes Dirt
I've got a USB (Lexar Echo 16gb) and i've filled it up with movies and stuff. Then when i've "moved contents to trash" (MAC) the USB says that I've got the same available capacity as when i've got a full 15.5 gb of content.

is there someway in which I can fully delete the content. Or am I simply f'ed?
 
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