To understand semiconductors properly, you need quantum mechanics - once an obscure theory that Einstein never accepted.
Today's hard discs rely on the Giant Magnetoresistance (GMR), an effect based on the spin polarizations of electrons. Spin is a property that can only be understood with quantum mechanics, there's no proper classic theory (and I guess there never will be) of spin.
To understand semiconductors properly, you need quantum mechanics - once an obscure theory that Einstein never accepted.
Today's hard discs rely on the Giant Magnetoresistance (GMR), an effect based on the spin polarizations of electrons. Spin is a property that can only be understood with quantum mechanics, there's no proper classic theory (and I guess there never will be) of spin.