Hello and welcome Mike!
Sorry, we don't have a solution for your problem
The WD WD5000AAKB seems to be incompatible with the NAS1000 or NAS2000.
In the last days there have been 2 users reporting the same problem.
Post
#1 #2 and
#3 in German language.
Raidsonic support has been informed about that. Up to now they thought all disks are compatible...
Regards,
HWguru