Upcoming tablets likely will include a micro-USB 3.0 port to enable faster charging and to connect to newer peripherals such as speedy USB 3.0 drives. Today's situation is a little messy, however. Your average slate might have a microUSB, miniUSB or full-size USB port. It might support USB 2.0, not USB 3.0. The latest version of the world's most popular tablet, the iPad, has no USB port at all, only the proprietary Lightning connector. Apple does sell a Lightning to USB cable ($19), but the peripheral supports only USB 2.0, not USB 3.0.