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They’re supposed to label the USBs so that you can tell which side is the top side and which side is the bottom side.
The problem is that, A they often don’t label them and, B I can’t remember which way round it’s supposed to go anyway, so it wouldn’t help.
Most things I have are labelled properly, and I’m only hedging my bets by saying most because I can’t think of anything I own that isn’t labelled properly