Platters are not made of iron (or even steel) and neither is the surface, so I’m not sure why rust comes into the picture.

The platters used to be coated with iron oxide as the magnetic coating.

Modern ones use more exotic materials.

Yes but that was like 40 years ago. I think by now the phraseology should reflect reality after about forty years.

	▲	theandrewbailey 19 hours ago \| parent \| next [-]
		We still talk about "bugs" (99+% of computer defects in the past 70+ years have not been caused by insects) and "AJAX" (long after most of these requests use JSON instead of XML).
	▲	jacquesm 19 hours ago \| parent \| prev \| next [-]
		How many horsepower does your car have?
	▲	arcanemachiner 19 hours ago \| parent \| prev \| next [-]
		Ironically, I only started hearing the term being used in the past decade, as a colloquial alternative to solid-state storage.
	▲	seanhandley 19 hours ago \| parent \| prev [-]
		“Phraseology” is subtly different. You mean “vocabulary”, “terminology”, possibly “nomenclature”.