Amazon Kindle User Manual page 109

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 unmount 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 unmounting or
ejecting the Kindle from the computer. Note that it is always best to use your computer
to unmount or 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 4 EDITION
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Chapter 8 · 109