Turn on or turn off USB mass storage mode
smartphone is connected to your computer with a USB cable but doesn't appear as a drive on your computer, you may have to turn on USB mass storage mode.
On the home screen or in a folder, click the
Enable USB Mass Storage
If necessary, type your smartphone password.
Your smartphone appears as a drive on your computer.
To turn off USB mass storage mode, press the
How to: Storage space and media cards