|Apparently it's a LG External GE24 Super Multi DVD "burner" drive.|
It comes with an AC to DC power adapter, and a USB cable to connect it to a computer.
The power adapter MUST be plugged into the external case and be powered.
The USB port you plug the USB cable into MUST be able to supply 500ma of current.
You may need to plug it into a different USB port .
Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
The things in that info that apply to external hard drives also mostly apply to external optical drives because external optical drives also require 500ma from the USB port you plug it into.