Pressing the power button while the Pi is off will turn on the Pi. Pressing the power button for at least 3 seconds while the Pi is on will safely shut down the Pi and turn it off. This is indicated by the green LED blinking. Pressing the power button for less than 3 seconds while the Pi is on will do nothing. Pressing the power button twice while the Pi is on will reboot the Pi. This is indicated by the green LED blinking. Pressing the power button for at least 5 seconds while the Pi is on will force shut down the Pi. This is indicated by the sudden stopping of the Pi.
Ещё 64 бита существенно быстрее для больших MMF файлов. Потому что нет проблем с непрерывным свободным адресным пространством. Именно поэтому БД отказались давно от 32х бит