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So as stated we received a 2 HDD tray version of this NAS unit. The NAS supports Hot Swappable Hard Disks, and comes with proper Disk Tray Locks.
  

ASUSTOR has an advanced and easy to use tray system, actutally very easy to use. You can mount your HDD, secure them with four screws and slide it into the tray. By pushing the handle inwards the HDD is mounted and locked secure.
 

 
You will have noticed four holes at the bottom side in the previous photo, that was indicative as you can mount 2.5" devices such as SSDs as well. Actually you could use an SSD for fast IO where you need it with APPs / downloads etc. In fact we'll do that today.

 
This is the unit powered on, we have the SSD installed. The green lights indicate all storage units are OK. If a HDD goes bad, that LED will color red.