You can change the HDD Authentication Code of the Enhanced Security HDD option.
Log in as the machine administrator from the control panel.
Press [System Settings].
Press [Administrator Tools].
Press [Next] 4 times.
Press [HDD Authentication Code].
Enter the authentication code, and then press [OK].
You must enter an authentication code that consists of between 8 and 32 alphanumeric characters.
Press [OK].
Press [Exit].
Log out.
If you want to change the HDD Authentication Code, repeat the procedure.