Schijf status unknown after import

[David Dunnaway]

I use FreeNas for a long time, no issues until now. I have upgraded from an older version to FreeNas 8.0.3-Stable. When i import the harddrive, de status from only 1 harddrive changed to HEALTY, others stays on UNKNOWN. How i can fix this ? I have already rebooted the server, reinstalled. I can not format the disks like i already have been done with an 1TB harddrive full of data. Currently not able to backup the current data on the disks.