Half Capacity drive

So I bought this mini 64 gig flash drive and I cant get it to store more than about 32 gigs does anyone know why this is and how I might fix it?

https://www.amazon.com/gp/product/B01BGTG3JA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Did you format it?

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