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for future reference:
Drive platters are composed mostly of highly polished aluminium or glass with thin layers of other materials deposited on then. These materials used are to achieve the required smoothness, magnetic storage capability and lubrication.
The materials used in the layers are Ruthenium alloys, Cobalt-Nickel-Iron alloys, Cobalt-Chromium-Platinum alloys.
safe to say there is more than a hand full of different answers to what material the platters are made from, but for your answer any 3.5 hard drive platter would be safe to cut a slot in it.. Regardless if you do have any doubts for any project just take necessary safety measures - sectioned off designated workspace with close proximity to tap water, fire extinguishers and liquid spill kits. And safety wear (goggles, gloves, fitted clothing preferably fire resistant material).. a second person is also a good idea, not much one person can do with any issue if they were to be knocked out (ive worked with all sorts of industrial machines and every power tool and never had any accidents but i was once knocked out for a few minutes when a small dremel hobby drill caught one of my dreadlocks that fell in front of my face, wrapped up the dread pulling drill from hand and smacked me right in my temple. Had it been a lathe i may have been scalped)
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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Posted:Apr 7, 2010
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