Huawei Ascend G630-U20 User Guide - Manual (Page 49)

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Sharing data
Mass storage mode
In mass storage mode, you can use your phone as a USB mass storage device
and transfer files between your phone and a computer.
1. Use a USB cable to connect your phone to the computer.
2. On the USB computer connection screen, choose USB storage device .
The phone driver is then automatically installed on the computer.
3. The computer will identify your phone as a USB mass storage device. You
can then transfer files between your phone and the computer.
If you unplug your phone from your computer while it's transferring or
saving data, you might risk losing some data.