Be aware of the following at HDD installation and recovery:
The network disk recorder, WJ-ND400, is described as ND400 and the extension unit, WJ-HDE400, as
HDE400.
<Notes for HDD installation>
If an HDD unit is added during the operation described below, the ND400 and HDE400 do not recognize the
HDD unit to be added.
• Process of HDD recognition
• Process of HDD removal
• Process of logging in the configuration using the Web browser
• Process of measurement using the Web browser
Solution
Remove the unrecognized HDD unit once, and install the HDD unit again after completion of the operation
described above. When installing 2 or more HDD units, perform HDD recognition unit by unit.
<Notes for RAID5/RAID6 recovery>
Never turn off the power during the RAID5/RAID6 recovery. Failure to observe this may fail to retrieve the
data.
The following cases obstruct the start of RAID5/RAID6 recovery.
• C ase that the failed HDD unit is replaced in the power-off state and then the power of this unit is turned
on
• C ase that 2 HDD units are replaced and then the power of this unit is toggled on and off during the
recovery of one HDD unit when 2 HDD units in the RAID6 fail
In this case, the recovery of one HDD unit will start, but the recovery of the other HDD unit will not start.
Solution
Remove the HDD unit the recovery of which will not start, and install the HDD unit again.
Notes on handling HDD