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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
Build a 15,000 rpm Tesla Turbine using hard drive platters
Recycled Hard Drive Desk Clock
Simple Hard Drive Platter clock
Commemorative Hard drive clock
Hard drive platter clock.
Glow in the dark RAM clock
Hard Drive Persistence of Vision (HDPOV)
GEEK-TO-YOU: How to take apart a hard-drive (humor included)
Miniature Revolving Solar System
2.5" HDD Clock
Posted:Apr 7, 2010
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