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At the top left and rear side, there is space for your HDD units, with easy drive installation. Let me zoom in on the securing mechanism though. 

You can easily insert and/or remove these. You place the HDD in a tray, slide it backward in the cage and secure it with the hinge. It is as simple as that. The HDD or SSD mounts itself in rubber inserts. Once mounted you just slide in your SSD or HDD, it really is that simple. The chassis comes standard with one cage that supports two 3.5 inch and another three 2.5 inch drives. 

You will not spot room for optical drive bays (5.25"), so if you need one, only an external USB based optical unit would be an alternative. But you could mount 2.5" SSDs on the 3.5" trays as well with some screws. So, in theory, you could mount even five SSDs accumulated.

Mounting a 2.5" SSD device could not be any easier. Pop it into the tray, slide it downwards and has been seated, secured and is ready for takeoff.