Toshiba L300 recovery

just found the answer , with the notebook turned off , hold down the numerical "0" and while holding it down power up notebook, this takes you to the hidden partition.
a. Turn off the notebook before starting.
b. Hold down the zero (numerical zero) key down.
c. Press the power button to turn on while still holding the zero key until the loading files or ram disk image appear on the sceen.
d. Follow the Toshiba recovery wizard screen.
e. For further information please refer to the information from your user manual.