Mitel 3300 Technician's Handbook page 227

11. Push to seat the hard drive into the hard drive backplane.
12. Tighten the thumb screw.
13. Install the controller cover and power up the controller; see page 14.
14. The rebuild process starts automatically. The source drive LED (HD1)
flashes quickly while the destination drive LED (HD2) flashes slowly.
The rebuild is complete when the HD2 LED no longer flashes slowly
(approximately 80G per hour).
15. Reconnect the controller to the network.
Install and Replace Units
217