Notes On Power Saving Modes - Sony VAIO User Manual

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To activate Hibernate mode
1 Press the key combination Fn+F12, or press the power button and release it
immediately. The "Save to Disk Manager" screen appears, and the computer
enters Hibernate mode.
Do not move the computer until its power indicator turns off.
2 Press the power button to return to normal mode.

Notes on power saving modes

Standby uses more power than Hibernate.
Standby requires less time than Hibernate to return to normal mode.
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