Is there any specific note regarding the compatibility of this riser card?

Yes, it is noted that the riser card is too tall for the D Storm 2U chassis and may require modification.

What type of riser card is the iStarUSA DD-666-2U-M?

The iStarUSA DD-666-2U-M is a 2U PCIe x16 to PCIe x16 riser card in a middle position.

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iStarUSA DD-666-2U-M 2U PCIe x16 to PCIe x16 Riser Card Middle Position