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Please say what models every disk.
This system do not support mix SATA and SAS HDD.
What show when you insert one disk as HDD1 or HDD2 ?
Check SAS cables that connect DISK Backplane and MotherBoard.
The HDD-0 drive is a Hitachi UltraStar Model HUA7250SBSUN500G and the HDD-1 drive is a Hitachi DeskStar HDS725050KLA360. Both drives can be seen by the BIOS if they are in the HDD-0 slot but no drives can be seen in the HDD-1 slot. Both drives are SATA not SAS. There is no SAS system installed in this Ultra 27. If I put the Hitachi UltraStar Model HUA7250SBSUN500G in the HD-1 slot it is not recognized in the BIOS. If I put the Hitachi DeskStar HDS725050KLA360 in the HDD-0 slot it is recognized by the BIOS. The problem is that the BIOS is not recognizing any hard drive in slot HDD-1.