The drives you got are generic/retail drives. You should be using certified drives. Uncertified/generic drives may or may not work normally, but the warnings will always remain.
I have a DELL PowerEdge R730 Server, which was ordered from Dell with 5 1.2TB 2.5" HD's which are configured in RAID 6. I purchased 3 more HD's of the same size/capacity to add to the array from Dell. The HD's are physically seated fine, however I am unable to add them to the array. The 3 new HD's show as being 'Seagate', whereas the 5 that came with the server on initial purchase show as 'Dell'. The 3 new HD's show as online, but with a non critical warning icon and are not availible to add in the reconfigure array wizard. Is the make/model of HD an issue here, should all 8 HD's be indentical? Is there a procedure unique to Dell for adding HD's to a RAID 6 array i should follow?
DELL PowerEdge R730 Server; Adding 3 new HD's to RAID 6 with 5 HD's