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<p>are typically made using an <a href="page.php?w=aluminium">aluminium</a>, <a href="page.php?w=glass">glass</a> or ceramic substrate. Laptop hard drive platters are made from glass while aluminum platters are often found in <a href="page.php?w=desktop_computer">desktop computer</a> drives in lower capacities(under 12TB) those using helium filling use very thin glass platters due to limitations of aluminium.  In disk manufacturing, a thin coating is deposited on both sides of the substrate, mostly by a <a href="page.php?w=vacuum_deposition">vacuum deposition</a></p><p>
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