Yeah I thought it might be resonance between two drives moving similarly in a mirrored pair, so swapped the drive order around, but that made no difference eith

Yeah I thought it might be resonance between two drives moving similarly in a mirrored pair, so swapped the drive order around, but that made no difference either. I've used primarily WD drives for years but I think my next pair will be from a different manufacturer and will likely replace these golds, which can be relegated to a second machine in my shed where I can't hear them.