The Nexus 7 and Moto G are OTG(on the go) compatible devices. You can buy an OTG cable from Amazon. An OTG cable provides many features for your tablet. For example you can connect your USB to your tablet or connect a mouse or keyboard. This is useful when you are on vacation and want to view your photos that you have taken. Some applications allow you to use your tablet as a screen for your DSLR. Another good feature it provides is letting you use your PS3 or XBOX 360 controller to play games. While the MotoG has native support for mass storage devices other devices might require the use of ES file manager to view the contents of a mass storage device.