USB drive works only in one port
System Management Controller (SMC)

Reset the SMC by following the instructions below, that should restore the power to the port:

1.Shut down the computer.
2.Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
3.On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
4.Release all the keys and the power button at the same time.
5.Press the power button to turn on the computer.

Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.