I have two 1 TB WD black HDD's in my computer and they run about 30 C.
How are you measuring the internal temp? With the MB PC Health SMART appl? or a separate source
I would check them with a different SMART appl, just to confirm the reading
The spec sheet says: Temperature (Metric) Operating -0° C to 60°, so 52 C seems high.
Is that measurement taken with the case closed so the front fan can blow across the HDD, and the computer idling?