Toshiba Portege Z30-A User Manual page 33

Data save in Hibernation Mode
When you turn off the power in Hibernation Mode, the computer will take a
moment to save the current data in memory to the HDD/SSD.
After you turn off the computer, and the content of memory has been saved
to the HDD/SSD, turn off the power to any peripheral devices.
Do not turn the computer or devices back on immediately. Wait a moment
to let all capacitors fully discharge.
User's Manual 2-13