Hard disk material

[Brent Hilpert]

Eric Smith wrote:
> 
> Brent Hilpert wrote:
> > Weren't drums and early disks done with nickel or some-such plating, rather
> > than binder & oxide?
> >
> Nickel plating would definitely not work.  Some of the earliest drums
> used cunife (copper/nickel/iron alloy) wire tightly wound around an
> aluminum cylinder, then turned on a lathe to get a flat surface.  Some
> drums included magnesium, cobalt, or other metals in the alloy.  Later
> drums used various coating methods rather than wire.

(Yes, I missed including the word 'alloy' in there.)