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I had no idea, but it turns out they're a mix:

> Platters are typically made using an aluminium, glass or ceramic substrate. As of 2015, laptop hard drive platters are made from glass while aluminum platters are often found in desktop computers.

> In 1990, Toshiba released the MK1122FC, the first hard drive to use a glass substrate... It was originally designed for laptops, for which the greater shock resistance of glass substrates are more suitable.




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