Toshiba Satellite Pro 6000 Series - Manual (Page 259)

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Hibernation mode
Fn + This hot key puts the computer into Hibernation mode.
If Hibernation mode is enabled (the default) a message box
is displayed by default to confirm the computer is going into
Hibernation mode. The message box can be set so it doesn’t
display.
Sample Hibernation confirmation box
If Hibernation mode is disabled, this hot key will not
respond. For more information on Hibernation mode, see
“Enabling Hibernation” on page 177 .