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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.
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
Hard drive platter clock.
Commemorative Hard drive 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
Recycled Hard Drive Clock - FuneLab
Posted:Apr 7, 2010
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