Flash drive full but no files showing

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Can anyone help me out? Seems like I've got plenty of free disk space to do this. The PST file is ~5.0 gigs and has already been compressed down from ~10 gigs. The drive is 8 gigs, I've got various files on there that take up ~2+ gigs, and about 5.7 gigs of space remaining.

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Flash Drive Says Not Enough Space but There Is Plenty.