Why does more reliable and safer WD data center HC320 8TB have a bit more noise and more power consumption ?

Hi, guys out there.

I just ordered a WD data center HC320 8TB HDD.  A lot of guys say it has a bit more noise, or rather more power consumption than other models. But it's manual says it provides more data reliability(e.g. head positioning accuracy) and safety.  I guess chances are there's a tie between noisiness and reliability & safety. If so, what is the tie ?

I'm no expert.  I'm imagining...only one person holds head(access to sectors) in ordinary models whereas two persons do it in HC320 8TB. Is this an acceptable analogy?

Thx in advance. 

Best, Dave.