How to Configure the USB on Your Nexus 7
The most direct way to connect a Nexus 7 to a computer is by using a wire — specifically, the USB cable. You can do lots of things after making the USB connection. It all starts with connecting the cable.
The difference between the MTP and PTP connections are in how your computer recognizes the Nexus 7. If you’ve set the USB connection to MTP, the computer is fooled into thinking that the Nexus 7 is a portable media player. For the PTP connection, the PC believes the tablet to be a digital camera.
Determining whether the Nexus 7 uses the MTP or PTP connection is done by following these steps:
At the Home screen, touch the All Apps button.
Open the Settings app.
Touch the Menu icon button, and then choose the command USB Computer Connection.
The two options are MTP and PTP.
Ensure that there’s a check mark by the Media Device (MTP) option.
Touch the Home navigation button to return to the Home screen.
You should use the MTP connection because it’s the most flexible. If you find the Nexus 7 not recognized by your Windows computer, rework these steps and choose the PTP option.
MTP stands for Media Transfer Protocol. PTP stands for Picture Transfer Protocol. Do not bother memorizing these terms.