Upgrading capacity of G-Raid 0G02492

Just purchasehe enclosure. Q1: can I use any type of HDD in it (specifically: 2 x 4TB WD Red NAS d (see attached image)ri? Q2: inside the enclosure, there’s an additional cable coming off the circuit board inside, that looks like a ground. Any idea where this needs to be connected to?

Thanks

Shaq