There is a small metal button in the front of the drive and you can use that to eject the drive if you were wondering.
I've installed the second hdd no problem, but for some reason the hdd spins up, shuts down then spins up again and shuts down for a final time. The computer does not detect the drive and I've tested this externally, internally and with two different hdds, and I've had no luck whatsoever. Anyone have a similar problem and/or a solution! Any responses are greatly appreciated.