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Users Really Do Plug in USB Drives They Find. We investigate the anecdotal belief that end users will pick up and plug in USB flash drives they find by completing a controlled experiment in which we drop 297 flash drives on a large university campus.
'A' Plug, 'B' Plug and 'Mini-B' Plug. As stated above, USB uses different connectors on host and device to enforce correct connections. A receptacles point downstream from a Host or Hub, while B receptacles point upstream from a USB device or hub.