
Pretty sure they are all WD-era Ultrastars now.
Only gotcha I ever found with them (and some shucked WD reds several years ago I think) is to disable the 3.3v pin. Plenty of different methods for that, but I just snipped it out of the power cable. Lots of posts online explaining it, it’s not an ultrastar specific deal.
Nah, nothing to do with noise.
As far as I’m aware it’s a feature to control power to the disk. Look it up to confirm if you’re interested, but I think power delivered on that pin keeps the hdd off. Cutting the power (or snipping the power cable in my case) causes it to function normally. Plenty of people have bought these drives and assumed they are dead (including me!) when plugged into a regular PSU, which just supplies the power. I assume enterprise servers allow you to turn the 3.3v pin on and off. I suspect it’s more useful in datacenters etc to restart problematic drives & run diagnostics etc remotely before having to go and actually find the thing in the server/rack/aisle of racks/warehouse of racks etc.
Someone here will know more than me.