Purchased 2. Both bays are hot-pluggable. Exactly what I needed. I found I had my third tray open after getting rid of my old Blu-ray, so I bought a third. I gave 4/5 for the materials only because the plastic is pretty brittle. But it's good enough to use. Just don't drop your server case or anything like that. The only improvement I've seen is the placement of the internal 2.5-inch SSD bay on the back to make a little more use of the space.
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