I’ve had my Drobo S for about 24 hours, and the noise is driving me nuts. OK, the fan is a little louder than that in my Mac Pro, but I can live with that.
I’ve just realised where the annoying noise is coming from. It’s the power supply. It sounds like fingers being scratched down a blackboard - high pitched scratchy noise.
At first I wondered if it was the noise from multiple hard drives all running at the same time, and couldn’t understand why it was so much more prominent than the noise from the drives inside my Mac Pro.
Holding my ear to the Drobo power supply it’s definitely coming from that. I’ve tried it through my UPS (APC BackUPS RS 1500VA) and through a normal surge protector, and it’s the same.
Is this (unbearable) noise considered normal? I remember my old PowerMac G5 made similar noises under certain graphics intensive situations - and I was glad when I finally replaced it.