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[SOLVED] Disk detected by controller, but not by Unraid

[SOLVED] Disk detected by controller, but not by Unraid

I had to replace a harddrive in my Unraid Server and so I attached a new Seagate SAS-Drive. It's correctly connected and the config-utility of the SAS-controller does detect the drive. (see picture, it's the one in Slot 6) Unfortunately though Unraid does not detect the drive and I can not assign it in the webui.   What could be the solution here? Thank you for your support!  
I had to replace a harddrive in my Unraid Server and so I attached a new Seagate SAS-Drive. It's correctly connected and the config-utility of the SAS-controller does detect the drive. (see picture, it's the one in Slot 6) Unfortunately though Unraid does not detect the drive and I can not assign it in the webui.   What could be the solution here? Thank you for your support!