I wanted to comment that the excuse from WD that Linux has a bad Power Management and accesses the hard drive to often seems to be a completely nonsense. I also experience the extreme increase of load cycles. My WD30EZRX is installed as secondary drive which is only accessed when I do it manually. There are no log files or something else stored at it. This is also supported, when I stop the drive actively:
hdparm -y /dev/sdc
Then it sleeps until I wake it up. So nothing touches the drive. So the solution would be to disable the WD power management and use something like
hdparm -S 60 /dev/sdc
But unfortunately WD offers no way to disable power management or setting spindown timer.
My conclusion: This drives are something for trash and not for a computer.