I've got an Asus X99-E WS board with
C drive: 1 * SSD
D drive: 2 * SSD, RAID 1
E drive: 2 * HDD, RAID 1
While Defraggler correctly recognizes the C drive as SSD (which becomes hidden after setting the appropriate Defraggler option), the D drive still is visible and displayed as HDD (see attachment).
This seems an error to me. Please verify.