User's Guide

6 Managing power
Your computer can operate on either battery power or external power. When the computer is running
on battery power only and an AC power source is not available to charge the battery, it is important to
monitor and conserve the battery charge.
Initiating and exiting Sleep and Hibernation
Windows has two power-saving states, Sleep and Hibernation.
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Sleep—The Sleep state is automatically initiated after a period of inactivity. Your work is saved
to memory, allowing you to resume your work very quickly. You can also initiate Sleep manually.
For more information, see Manually initiating and exiting Sleep on page 30.
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Hibernation—The Hibernation state is automatically initiated if the battery reaches a critical level.
In the Hibernation state, your work is saved to a hibernation file and the computer powers down.
You can also initiate Hibernation manually. For more information, see Manually initiating and
exiting Hibernation (select models only) on page 30.
CAUTION: To reduce the risk of possible audio and video degradation, loss of audio or video
playback functionality, or loss of information, do not initiate the Sleep state while reading from or
writing to a disc or an external media card.
NOTE: You cannot initiate any type of networking connection or perform any computer functions
while the computer is in the Sleep state or in the Hibernation state.
Initiating and exiting Sleep and Hibernation 29