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At the top left and top rear side there is space for your storage 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 backwards 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 Carbide AIR 240 comes standard with one cage which supports three 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 alternatively mount 2.5" SSDs on the 3.5" trays as well with some screws. So in theory you could mount even 6 SSDs here.

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