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Why is your USB drive so slow? If your drive is formatted in FAT32 or exFAT (the latter of which can handle larger capacity drives), you have your answer.
USB drive vendors tend to format their drives at the factory with FAT32/exFAT because every device that can read USB mass storage can read and write to these well-known formats. That includes, but is not limited to: Windows PCs, cell phones, car radios, Linux, and OS X/iOS devices.