Hello, I currently have a 24x 2.5" SFF R740xd with all three risers. (total eight vertical PCI-e slots)

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As 3.5" HDDs are much much much cheaper than 2.5", I was planning to use a mid bay expansion (Part No. F7DF5) and mount 4x HDDs on it.

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For this, I removed Riser 2 & 3, as they interfere with the mid plane. As I had a BOSS card and a H740P controller, I mounted both of them into Riser 1 (which is in the opposite direction of the PSU). Then I connected the power, and the SAS cable to the front panel.

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However, the error occurs: The storage BP2 SAS A0 cable is not connected, or is improperly connected.

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I’m desperately seeking for help. I tried a lot to find any documentations actually stating which connector & place I should use, but no luck until now. I would appreciate any means of help.

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Thanks in advance.

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Photos:

Where the SAS cables from the H740P (pci-e) are plugged. (pre-occupied)

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Where I plugged the SAS connector labeled BP_A1 (tried both)

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Where I plugged the SIG & PWR

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