Hi, my computer is a few years old now, so I thought it could use some upgrades, the biggest issue I am having with my computer is that space is now limited and hard to control my current hard drives are seagates... so I just bought 2 new hard drives, one is WD 2TB and the other is 4 TB, I would like to fit this in with the sea gates, I do have 2 free sata ports left, and would like to know if its possible to fit 2 new hard drives in with the sea gates.