Sony VGX-TP20EB - Manual (Page 103)

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Customizing Your VAIO Computer
Using the Power Saving Mode
In addition to the normal operating mode, which allows you to turn off specific devices, your computer has a distinct power
saving mode called Sleep mode.
Using Normal Mode
This is the normal state of the computer when it is in use. To save power while not working, you can turn off a specific device
such as the connected display or the hard disk drive.