add maximum perfomance mode?

hi. how to add maximum perfomance mode in power management? there is only balanced now. how to prevent hdd from sleeping also? (there is no hdd settings in advanced power management) win8.1 x64
hi. how to add maximum perfomance mode in power management? there is only balanced now. how to prevent hdd from sleeping also? (there is no hdd settings in advanced power management) win8.1 x64