Weird usb space problem

QuestinMarks

Reputable
Apr 15, 2014
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For some odd reason my usb stick has less than 4mb left and there is only 2gb of files in it. (it’s 16gb). And I know that there aren’t any hidden files since I have the show hidden files option on.

What could be the cause of this problem?
Are there my files that cannot be seen or something?