Amazon KINDLE Manual page 129

The illustration below shows a Kindle and a laptop computer connected through
the USB cable.
When you are connected to your PC, your Kindle will go into USB drive mode and
its battery will be recharged by the computer. Your Whispernet service is temporarily
shut off and you will not receive any of your subscriptions while in this mode. Also,
your Kindle is not usable as a reading device while you are in USB drive mode, but
will return right to where you were when you eject the device from your computer.
Tip: If you'd like to continue reading your Kindle while its battery is being charged
by the computer, you will need to release it from USB drive mode by ejecting the
Kindle from the computer. Note that it is always best to use your computer to eject
your Kindle before disconnecting the USB cable. Consult your computer manual for
details on how to properly disconnect a USB storage device.
KINDLE USER'S GUIDE 5 EDITION
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Chapter 8 · 129