If you reset the motherboard back to factory defaults.
The reason why the other hard drives may not be detected is because you have two Sata controler chips on the motherboard.
As an example some motherboards have an Intel based Sata control chip where it supports so many of the Sata ports of the motherboard.
But there is also a second Sata based controler chip also that supports the rest of the Sata ports of the motherboard.
Such as as a ASmedia sata chip.
By factory default only one of the Sata chipsets is enabled.
And you have to enable the other chip set by manual selection in you bios.
The four black Sata ports may be controlled by the Intel Sata chipset.
And the two white coloured Sata ports may be controlled by the ASmedia Sata chip set in the bios.
If the SSD drive is connected to a white sata port on the motherboard, and the optical drive is connected to the other white Sata port of the motherboard, then it would explain why the three other HDD are not picked up or detected by the bios because the other Sata chipset is no longer enabled due to the factory default of the bios.
So check for two Sata chip sets and make sure both are set to enabled in the bios Singularity.