Not to be paranoid, but there are "fake" USB sticks which advertise a very high capacity but can actually hold only, say, 8 GB. As soon as you write more data to them than they can actually hold, things go downhill.Part of that included a 512GB Dunkin' Donuts branded USB stick. That thing has just been sitting around because, well, who has a use for a 512GB USB stick?
H2testw (for Windows; click "Download" on the site; the tool's GUI can be switched to English) will test if a drive actually has the capacity it advertises. I wouldn't trust a "512 GB" drive until this tool confirms it is what it claims to be.
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