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Perhaps several hours of "up-time" means that the drives are in constant use. Under those conditions the unit probably gets warm(ish). If the unit is idle it (well, mine) remains at room temperature and feels cool to the touch. My 325s are certainly cooler than my 320s.It really depends on how the unit is used and what you call "warm" and "hot".
Determining that the DNS-325 runs too hot is a very subjective conclusion. Some questions for the reviewer: What was the ambient room temperature during the test? Was the DNS-325 in an open room or enclosed area (i.e. closet)? What were the DNS-325 fan settings? Were the HDDs actively accessed during the duration of the test? What were the sleep/hibernation settings? How many HDDs were spun-up (1 or 2)?"Warm to the touch" is very subjective and doesn't mean too much to me without further clarification and quantification.
The working temperature with off / low / high is around 40 º C ... normal??