why does turn off button means hibernate on my win8

when I upgrated my laptop's system to win8.*,I found it's hibernate when I clicked turn off button.

but sometimes you need restart your computer.if you don't like this,you can change it.there is a new function which called turn on fast startup in win8.it's on by default.you can off 'turn on fast startup'.

you can find option here,Control Panel\Hardware and Sound\Power Options\System Settings

why does turn off button means hibernate on my win8

 

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