@thrrgilag
The motors in those things were bullet proof. The stepper motor head actuators are another matter.
Those things had no "reference platter" like voice-coil actuators. Atmospheric pressure, heat, humidity, age..all of those things slightly move those things "off-true"
You used to have to "low level" those drives every year or so to assure that you would;t start losing data. There were some programs like Optune that sorta kinda did that for you in a non-destructive way.
As far as I know, this system has NEVER had that done in all these years. It is in Florida - Home of humidity, storms, etc. It has run the business since it was new.
It's pretty freaking incredible.
// @phoneboy