Defraggler doesn't recognize SSDs in RAID configuration

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.

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