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from outter-most layer to inner-most layer, the composition of a 3.5" hard drive platter is as follows...5 micron thick layer of cobalt, the magnetic data substrate. 20 micron thick layer of 90% nickel & 10% phosphorus, making the nickel non-magnetic (This layer is present because nickel takes a very high polish and cobalt (the outter-most layer) does not adhere well to the inner-most layer. The inner-most layer is comprised of 96% Aluminum & 4%Magnesium; Aluminum is cheap and lightweight, and magnesium strengthens aluminum.
I happen to work with a Niton X-Ray gun and came across a few hard drive platters at work. So I gunned them :) Heres what I found:
I igrinder the surface to get a more accurate reading, though , despite my best efforts , I may have just ground the nickel deeper into the matetial
But what about the platinum? Shouldn't it be covered with that too? http://www.ebay.com/gds/Paying-too-much-for-platinum-from-hard-drive-platters-/10000000008494913/g.html
mine just shattered. thats why im here.
Hahaha! That's why I'm here
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Recycled Hard Drive Clock - FuneLab
Posted:Apr 7, 2010
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