Sony VGN-S660P - Manual (Page 87)

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Customizing Your VAIO Computer
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If you do not use the computer for a long period of time, put the computer into Hibernate mode. This power saving mode saves you the time of shutting
down or resuming.
When the computer is in Hibernate mode, you cannot insert a disc.
Hibernate mode requires more time than Standby mode to be activated.
It takes more time to return to Normal mode from Hibernate mode than from Standby mode.
Hibernate mode uses less power than Standby mode.
!
Do not move the computer until its power indicator light turns off.