Gunnar Valdimarsson
                posted this
                13 November 2016
                
                
             
            
                Thanks for this,
I did change the drive to unconfigured and did like the manual said 
To manually rebuild a disk array in WebPAM PRO:
1. Click the Subsystem icon in Tree View.
2. Click the Disk Arrays icon.
3. Click the Disk Array icon.
If there are multiple disk arrays, choose the icon with the yellow !.
4. From the dropdown menu on the Background Activities tab, choose Start
Rebuild.
5. Choose Source physical drive.
The Source is a remaining functional physical drive in the disk array.
6. Choose the Target physical drive.
The Target is the replacement physical drive.
7. Click the Submit button.
But same Error. 
It it same type of hard driver
PD1  SEAGATE ST2000DM001-1ER164  SATA Disk  1.82TB  Encl 1 Slot 5  OK  Unconfigured  
PD2  SEAGATE ST2000DM001-1ER164  SATA Disk  1.82TB  Encl 1 Slot 6  OK  Array0 SeqNo1