This is a Large Form Factor (LFF) drive that is a SAS Drive 7.2RPM that increases the capacity of the G1000 Series Storage System by 4TB.  It is used in the HDS DF-F800-DBL Expansion Frame.

The Feature code for this drive = DKC-F810i-4R0H3MC

The Part Number for this drive = #5552784-A

The “P” designation is given to the drives that meet RoHS Standards, or RoHS applied.  The “A” drives designate non-RoHS applied.  The drives may be used together, even in the same expansion frame, without any technical issues.  an “A” drive may be replaced without issue with a “P” drive, and vice a versa.