312 Insert a new HDD unit into the HDD slot respective tothe HDD access indicator.Lift the lever on the HDD unit while holding down theremoval knob, and then insert the HDD unit all the way intothe HDD slot.(1) Pinch the tab on the HDD slot with the hook on theHDD unit securely.(2) Press the lever down and push it until the removalknob clicks.3 The recognition process of the hard disk drive willstart automatically, and then the data recovery willstart. When the data recovery starts, the respectiveHDD access indicator will light orange and red alter-nately.Data recovery will start soon after the "RCV START WAIT"indication is displayed.The following indication will be displayed during datarecovery (writing).4 When the data recovery is complete, the HDD accessindicator will go off or light green.When 2 hard disk drives are faulty (2DOWN) in the RAID 6mode, the data recovery of the second faulty drive will startafter the recovery of the first one is complete.(1)(1)(2)● Replacement of a faulty hard diskdrive in the RAID modeIn the RAID 5 mode, it is possible to read data on the otherhard disk drives and recover data even when a single hard diskdrive becomes faulty (1DOWN).In the RAID 6 mode, it is possible to read data on the otherhard disk drives and recover data even when 2 hard diskdrives become faulty (2DOWN).Important:• Do not turn off the power in the process of recovery. It mayresult in recovery failure.Note:• Replace the faulty disk immediately and recover data whena single hard disk drive becomes faulty (1DOWN) even inthe RAID 6 mode.1 Replace the hard disk drive whose HDD access indi-cator is lighting or blinking red.(1) Hold down the removal knob on the HDD unit.(2) Pull the lever up.(3) Pull the HDD unit out from the HDD slot.Pull the HDD unit out carefully so as not to drop it andhandle it gently so as not to give it a shock or vibration.(3)(2)(2)(1)