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Mounting an HDD could not be easier, take a drive bay bracket (has rubber inserts to prevent resonating noises from the HDD), lock them in and slide the unit into the drive bay until you hear a click.
These brackets can also hold a 2.5" SSD, you'll need to secure it with four mounting screws on the bottom side. It's a very simple solution really, but there's nothing wrong with simple as long as it's functional and effective. You can house a two 3.5/2.5 drives.
Here the rear side photo, look down below and notice the PSU location.
At the bottom side we can see the mounting area for the PSU, underneath it a ventilation mesh, which has dust protection with the help of a filter. So you need to install the PSU with the top fan downwards. Mind you that size is an issue, use a 150mm in length PSU only as you need to lead out the cables as well. If your PSU is too long then the cabling will bump into the drive bay. This is my one remark with this chassis.